The Science of Building Confidence: What I Learned From The Confidence Code
So guys, I’ve been reading The Confidence Code lately, and honestly, I’ve been in love with this book. It answers so many questions I always had about confidence — where it comes from, why some people seem to have more of it, and most importantly, how we can build it. I want to share some of the insights that stood out to me most, and how they completely shifted the way I see confidence today.
1. The Confidence Gap Between Men and Women
The book starts with one of the biggest findings: there is a measurable confidence gap between men and women. And here’s the surprising part — it’s not just cultural. There are real biological differences in the brain that influence how confidence shows up.
Women have larger and more reactive amygdalae, the part of the brain that processes fear and anxiety. This makes us more sensitive to risk and more cautious in the face of uncertainty.
Women also tend to internalize failure, taking criticism as a reflection of who they are. Men, on the other hand, are more likely to blame circumstances rather than themselves.
This isn’t about weakness or strength — it’s just how our brains are wired. But the consequence is powerful: men, even when they’re not objectively better, often step forward with more self-belief. That boldness gives them more chances to succeed simply because they try. Women, by contrast, hold back. We wait until we’re certain we’re “good enough” — which in reality means we often miss opportunities we’re already qualified for.
So, if men constantly overestimate their abilities, why can’t I do the same? Now, whenever I notice myself overthinking or doubting — whether it’s about posting something, applying for something, or just taking a chance — I remind myself: say yes, assume you can, and lean into overestimating a little.
2. The Biological Foundations of Confidence
One of the most fascinating things I learned is that confidence is partly genetic.
Genes that regulate serotonin and dopamine influence our baseline levels of optimism, calmness, and willingness to take risks. Some people are simply wired to be bolder, while others are more naturally cautious.
Hormones also play a role: testosterone has been linked to risk-taking and competitive behavior. In fact, studies where women were unknowingly given small doses of testosterone showed that they became more competitive and less collaborative.
So yes, part of your confidence is written into your biology. But — and this is crucial — it’s not the whole story. Genetics may load the gun, but environment and practice pull the trigger.
3. How Upbringing Shapes Confidence
Confidence is also deeply influenced by nurture. If you grew up with supportive parents who encouraged independence, you’re more likely to take risks and trust yourself. If you had parents who were critical, anxious, or overprotective, you may have learned to play small and avoid failure.
This means that genetics + upbringing interact. You could have a “low confidence” genetic makeup, but with nurturing encouragement, still grow into a bold and capable adult. On the flip side, even someone genetically wired for confidence can lose it if constantly discouraged.
4. The Most Empowering Truth: Confidence Is a Choice
Here’s where it gets exciting. The Confidence Code makes it clear that no matter your genetics or upbringing, confidence can be built. And the science supports it:
- Neuroplasticity — your brain is constantly rewiring itself. Each time you act confidently (even when you don’t feel it), you strengthen the neural circuits that make confidence easier next time.
- Visualization — vividly imagining yourself succeeding activates the same brain regions as actually doing it. Athletes use this to train; we can use it to rehearse confidence.
- Affirmations — when repeated in emotionally receptive states (like before sleep), they bypass critical filters and plant new beliefs.
- Journaling — reflecting on fears and reframing them creates new cognitive loops, helping you let go of perfectionism and limiting beliefs.
Most importantly, confidence grows through action. Each time you step forward despite fear, you prove to yourself that you can handle it. Confidence is not waiting until you feel ready — it’s acting and letting readiness catch up.
5. Confidence Is About Mastery
One thing I realized while reflecting on this: confidence is always tied to mastery.
If I’m in a conversation and I feel confident, it’s because I trust that what I have to say has value. That I can contribute something useful in that room. That’s mastery of communication.
If I’m a good football player, I feel confident on the field. But that doesn’t mean I’m confident in love, or in maths. Confidence is not one blanket trait you either have or don’t have. It’s different in each area of life.
That’s why many of us feel confident in some areas and insecure in others — and that’s completely normal. The good news is, with practice, you can build mastery in anything.
6. Why Pretending Doesn’t Work
I know from experience: forcing yourself to “be confident” doesn’t actually build confidence. There’s a difference between taking action while scared (which rewires your brain over time) and pretending to be someone you’re not (which just feels fake).
- Faking confidence often looks unnatural, or even arrogant.
- Inside, it feels uncomfortable, because you’re performing instead of growing.
- The deeper problem: forcing yourself to “be” someone else reinforces the idea that who you are isn’t enough — instead of building proof that you can grow into more.
That’s why confidence can’t be forced. It has to be built. Real confidence comes from stacking small wins and proving to yourself, again and again, that you can handle more than you thought.
7. Small Wins Build Big Confidence
Here’s the mistake so many of us make: we think we need to throw ourselves into huge, scary situations to “level up.” Public speaking. Two-week group trips with strangers. Toastmasters on day one.
But science shows this isn’t how you rewire confidence. If a big leap goes perfectly, great. But if it doesn’t, it can reinforce fear and set you back.
What works better is the small steps:
- Go to a café alone without hiding in your phone.
- Join a new class at the gym.
- Try a new sport like tennis or golf.
- Record a short video in a crowded street, even if people are watching.
These steps are uncomfortable, but not overwhelming. They’re small enough that you’re likely to succeed. And each small success rewires your brain, strengthening the “I can handle this” circuits.
That’s how confidence grows: 5% stretches, not 50% leaps.
