10 Costly Mistakes I Made in My 20s

The decisions that quietly shape your future — and how to get them right the first time.

Let me save you six figures and a decade of regret.

I’m not here to lecture you about avocado toast or Starbucks lattes. The internet is drowning in that garbage advice from people who’ve never actually struggled with money. I’m here to tell you about the mistakes that actually cost me real money—the kind that makes you sick when you think about it.

The real cost? Probably closer to $400,000 when you factor in compound interest and lost opportunities. But nobody talks about that part. Nobody tells you that the dumb shit you do at 24 will still be costing you money when you’re 45.

The Biggest Regret

Recent research from CFP Board surveyed Generation X Americans—people now in their 40s through early 60s living with the consequences of their 20-something decisions. Here’s what they found: 95% say their financial regrets have cost them real money. Not theoretical money. Not ‘what-if’ money. Actual, quantifiable, gone-forever money.

Their biggest regret? Not adequately planning for retirement. Only 37% are satisfied with their retirement savings accumulation.

More than half—53%—wish they’d planned for retirement earlier. And 43% believed they had ‘plenty of time’ when they were younger.

That ‘plenty of time’ mentality is the most expensive lie you’ll ever believe.

Separate research by Bankrate found that 77% of U.S. adults have a financial regret. The top three:

1. 22% regret not saving for retirement early enough
2. 18% regret not saving enough for emergency expenses
3. 14% regret taking on too much credit card debt

And here’s the part that should terrify you: 40% of people with financial regrets haven’t made any progress on fixing them in the past year. Forty percent. They know what the problem is. They’ve known for years. They’re just… not doing anything about it.

Don’t be that person.

MISTAKE #1: TREATING GOALS LIKE WISHES YOU MAKE WHILE BLOWING OUT BIRTHDAY CANDLES

I used to think about my goals all the time. Like, obsessively. I’d lie in bed visualizing success. I’d tell myself every January 1st that ‘this year would be different.’ I’d create elaborate vision boards and write manifestation journal entries.

You know what changed?

Nothing.

Because your brain doesn’t give a shit about your thoughts. It cares about your actions. And the gap between thinking about doing something and actually doing it is where dreams go to die.

The Research That Destroyed My Excuses

Dr. Gail Matthews at Dominican University in California conducted a study that should be required reading for anyone who’s ever set a goal. She recruited 267 participants from various businesses, organizations, and networking groups across the United States and overseas.

She split them into five groups:

Group 1: Just thought about their goals

Group 2: Wrote down their goals

Group 3: Wrote down goals AND action commitments

Group 4: Wrote goals, action commitments, AND shared them with a friend

Group 5: Did all of the above PLUS sent weekly progress reports to that friend

The results will piss you off if you’re someone who’s been ‘thinking about’ goals for years:

Group 5 was 33% more successful in achieving their stated goals compared to Group 1.

More than 70% of participants who sent weekly updates reported successful goal achievement (either completely accomplished or more than halfway there), compared to just 35% of those who kept their goals to themselves

Let that sink in. Double the success rate. Not from working harder. Not from being smarter. From writing shit down and telling someone about it.

But Wait, There’s More Research

A meta-analysis by Klein, Wesson, Hollenbeck, and Alge reviewed 83 independent studies on goal-setting and job performance. Their finding: employees with specific, challenging goals showed a 16% improvement in performance compared to those with vague intentions or no goals at all.

Sixteen percent doesn’t sound sexy. But over a career? That’s the difference between mediocrity and excellence. Between broke and comfortable. Between ‘I wonder what could have been’ and ‘I did it.’

Your Goals Are Garbage (Probably)

Here’s what nobody tells you: writing down ‘make more money’ or ‘get in shape’ is worthless. That’s not a goal. That’s a wish wearing a business suit.

The difference between ‘earn $10,000 from my side business by December 31st, 2026’ and ‘make more money’ is the difference between actually doing it and daydreaming about it.

One has a number. One has a deadline. One can be broken down into weekly actions. The other is just… hopeful thinking.

Do This Instead:

1. Write down 3 specific goals with numbers and deadlines (not ‘someday’—actual dates)
2. Tell someone who’ll actually hold you accountable (not your mom, not your spouse, someone who’ll call you on your bullshit)
3. Send them weekly updates whether you want to or not
4. Review and adjust every single week—not when you ‘feel like it’

MISTAKE #2: CHASING THE NEXT MILESTONE LIKE A DONKEY CHASING A CARROT

I hit my first six-figure year when I was 28. I’d fantasized about that moment for years. Six figures! The magic number! The proof I’d ‘made it’!

Guess how long I celebrated?

One day. Maybe less.

The next morning, I woke up stressed about the next target. Gotta hit $150K. Then $200K. Then… you see where this goes.

I’d climbed the mountain, but I never enjoyed the view. I was too busy staring at the next mountain, planning the next climb, feeling like a failure for not being higher already.

This Isn’t Hippie Nonsense—It’s Neuroscience

Research from UC Berkeley’s Greater Good Science Center and Indiana University studied people going through mental health counseling. They split participants into groups: one received standard counseling, another received counseling plus weekly gratitude exercises (writing gratitude letters).

The gratitude group didn’t just feel better. Their brains actually changed.

Brain scans three months after the intervention showed greater activation in the medial prefrontal cortex when experiencing gratitude. They’d literally rewired their brains by writing thank-you notes.

The Meta-Analysis That Changed My Mind

A comprehensive systematic review and meta-analysis published in 2023 examined 64 randomized controlled trials on gratitude interventions. Here’s what they found:

• 6.86% greater life satisfaction (measured on the Satisfaction With Life Scale)

• 5.8% better mental health (Mental Health Continuum-Short Form)

• 7.76% fewer anxiety symptoms (Generalized Anxiety Disorder scale)

• 6.89% fewer depression symptoms (Patient Health Questionnaire-9)

Those percentages might not sound huge until you realize we’re talking about the difference between ‘I hate my life’ and ‘I’m actually okay.’

Do This Instead:

1. Write down 3 specific things you’re grateful for every morning—not generic crap like ‘my family’
2. Get specific: ‘I’m grateful my dog greeted me like I was a war hero,’ not ‘I’m grateful for pets’
3. Do it for 6 weeks minimum—that’s when the brain changes start showing up in imaging studies

MISTAKE #3: CONFUSING PERFECTIONISM WITH PROFESSIONALISM

I spent years perfecting projects that never launched.

I’d rewrite the same email seven times. I’d wait for the ‘right moment’ to start that business. I’d hold off on publishing that article until it was ‘good enough.’ I’d redo the presentation one more time.

You know what all those perfect projects had in common? They never saw the light of day. They died in the limbo between ‘almost ready’ and ‘someday.’

The Research on Perfectionism Will Ruin You

A meta-analysis published in Cognitive Behaviour Therapy examined 416 studies with over 113,000 participants. They found that perfectionism had medium-strength correlations with:

• Anxiety (r = 0.38 to 0.43)
• Depression (r = 0.38 to 0.43)
• Obsessive-compulsive disorder symptoms

Translation: Perfectionists don’t achieve more. They just suffer more while achieving the same results. Or worse, they achieve less because they never ship.

Research in Frontiers in Psychiatry found that high-perfectionism students averaged anxiety scores of 23.86 compared to 14.83 for low-perfectionism students. They’re nearly twice as anxious, for zero additional benefit.

But it gets worse.

Perfectionist students showed more:

• Procrastination (avoiding tasks due to fear of not doing them perfectly)
• Avoidance (not starting projects because they can’t be perfect)
• Overcommitment (saying yes to everything to appear capable)

They didn’t launch better products. They just stayed stuck longer.

Do This Instead:

1. Ship the B+ version today instead of the A+ version never
2. Set a ‘good enough’ standard for everything except the 3 things that actually matter to your core goals
3. Celebrate imperfect progress like it’s a victory—because it is

MISTAKE #4: CONFUSING PLANNING WITH PROGRESS

I once spent six months creating the perfect business plan. Color-coded spreadsheets. Market research. Competitive analysis. Financial projections. SWOT analysis. The works.

You know what I didn’t do? Talk to a single customer.

Planning is sophisticated procrastination. It feels productive because you’re ‘working on it,’ but nothing actually changes.

Do This Instead:

1. Apply the 2-Minute Rule: if it takes less than 2 minutes, do it immediately
2. Plan for maximum 15 minutes, then take action for 45 minutes
3. Track completed actions, not planned actions—plans are fantasies until executed

MISTAKE #5: LIVING FOR THE APPROVAL OF PEOPLE WHO AREN’T EVEN WATCHING

I didn’t start my first business until I was 27 because I was terrified of what people would think if I failed. Guess what? Nobody was thinking about me at all. They were too busy worrying about what I was thinking about them.

The Spotlight Effect: You Overestimate By 200-300%

Social psychology research by Thomas Gilovich at Cornell demonstrates what’s called the ‘spotlight effect.’ In controlled experiments, participants consistently overestimated by 200-300% how much observers noticed their actions and appearance.

That embarrassing thing you did last week? They forgot about it 10 minutes later. They were too busy replaying their own embarrassing moments on loop.

Do This Instead:

1. Do one thing this week that scares you because of potential judgment
2. Ask: ‘Will this matter in 5 years?’ If not, stop caring
3. Build decisions on your values, not imaginary critics

MISTAKE #6: GRINDING HARD ON THE WRONG THINGS

I used to brag about 80-hour weeks. Look how dedicated I am! Look how much I’m sacrificing! Look how hard I’m working!

The Pareto Principle says 80% of your results come from 20% of your efforts. I was spending 80 hours a week on the wrong 80%. The hardest-working person rarely wins. The person working on the right things wins.

Do This Instead:

1. Identify your 3 highest-leverage activities—the ones that actually move the needle
2. Eliminate, automate, or delegate everything else ruthlessly
3. Track results weekly: which 20% drove 80% of outcomes?

MISTAKE #7: AVOIDING DIFFICULTY LIKE IT’S A CHARACTER FLAW

Every successful person you admire went through hell to get there. The overnight success took 10 years of invisible failure. Difficulty isn’t a bug—it’s the feature that separates those who succeed from those who quit.

Research by Robert Bjork at UCLA shows that ‘desirable difficulties’—challenges requiring effort—produce deeper learning and more durable skills than easy practice.

Do This Instead:

1. Seek challenges slightly beyond your current ability—that’s the growth zone
2. Reframe setbacks as data collection: what did this teach me?

MISTAKE #8: THINKING GRADUATION MEANT LEARNING WAS OVER

I thought my degree meant I was done learning. Massive mistake. What you learned in school is already obsolete. What you’ll need in 10 years doesn’t exist yet.

The only competitive advantage that lasts is the ability to learn faster than the world changes.

Do This Instead:

1. Dedicate 30-60 minutes daily to learning something valuable
2. Learn a new skill quarterly—language, instrument, technical skill
3. Teach what you learn—it deepens understanding by 90%

MISTAKE #9: TREATING HELPING OTHERS AS OPTIONAL

Research shows that setting life goals focused on helping others leads to more positive emotions and greater happiness than self-focused goals. It’s not altruism—it’s self-interest that happens to help people.

Neuroscience research reveals that acts of kindness trigger endorphin release and activate reward centers—the ‘helper’s high.’ You literally get a chemical reward for being kind.

Do This Instead:

1. One small act of kindness daily—it compounds faster than interest
2. Volunteer 2-4 hours monthly in an area you care about

MISTAKE #10: BELIEVING TIME IS ON YOUR SIDE

If you live to 80, you have 4,000 weeks. That’s it.

If you’re 25, you’ve already burned through 1,300 of them. You’ve got maybe 2,700 left.

Remember that CFP Board survey? 53% of Gen Xers wish they’d started retirement planning earlier. 43% thought they had ‘plenty of time.’

They were wrong. You’re wrong too if you think the same thing.

The Math That Should Scare You

Consider two scenarios:

Scenario A: You start investing $200/month at age 25 for 10 years, then stop at 35. Total invested: $24,000. Value at 65 (7% return): $226,000+

Scenario B: You start investing $400/month at age 35 for 30 years until 65. Total invested: $144,000. Value at 65 (7% return): $456,000+

Person B invested 6x more money but only ended up with 2x more. Starting earlier with smaller amounts beats starting later with more.

Time is the only resource you can’t buy back. You can always make more money. You can’t make more time.

Do This Instead:

1. Calculate your weeks remaining—it’s smaller than you think
2. Schedule what matters first, not last
3. Start investing now, even if it’s just $50/month—compound interest is your superpower

THE UNCOMFORTABLE TRUTH NOBODY WANTS TO HEAR

You can read this entire article. You can nod your head. You can think, ‘Yeah, that makes sense.’ You can bookmark it. You can save it to your reading list.

And then you can change absolutely nothing.

Most people will. I know this because I see it every day. People who know exactly what they should do but don’t do it. People who understand the consequences but hope they’ll be different. People who think they’re the exception.

Or you can pick ONE of these mistakes and fix it.

Not all ten. Just one. Do that for 30 days. Actually do it, not just think about doing it. Then pick another.

The research is clear. The data is verified. The path is mapped. But research and data don’t change your life. Action does.

Five years from now, you’ll either thank yourself for starting today, or you’ll be writing your own version of this article, warning others about the same mistakes you’re about to make right now.

Choose wisely.

If you made it this far, CONGRATULATIONS!  Thanks for sticking around and taking time out of your day.  I truly appreciate you. If you want to take control of your life and you want updates when more of my articles come out, Subscribe below and if you want to actually participate in these conversations head to my channel.

Cheers!

Adam

DISCLAIMER: This article is for educational and informational purposes only. It does not constitute financial, investment, tax, or legal advice. Always consult a qualified financial advisor before making investment decisions. Past performance is not indicative of future results.