Why is it so hard to explain yourself, especially in interviews?

Why is it so hard to explain yourself, especially in interviews? Someone asks: 'Tell me about yourself.' And suddenly your entire brain disappears. I think part of it is our caveman brains. When someone evaluates us, that ancient social alarm system goes: 'Do they like me? Do they think I'm competent?' But there's another layer. You're being asked to explain your own identity. And you don't experience yourself as a résumé. You experience yourself as this messy collection of experiences, values, interests, things you've built, and things you're still figuring out. So you're trying to compress your entire brain into thirty seconds. Good luck with that. But I've realized something: confidence doesn't come from finding the perfect description of yourself. It comes from experiencing yourself actually living that identity. The more you experience yourself making things, solving problems, making decisions, taking risks, and putting your work into the world, the more you actually know that person. And eventually, you don't have to convince yourself that you're that person anymore. You just recognize yourself. And there's something I've been trying that helps: use a mirror, or record yourself on video. Especially if you're someone with a really relational brain like me, there's something different about actually seeing yourself. You start noticing everything. The awkwardness. The flaws. But also the good parts. And the more familiar you become with that person, the less you feel like you have to perform them. So instead of just telling you to try it, allow me to practice on screen. Here goes... 'Hi, my name is Tim. I'm a designer at heart, a product person, and an engineer. My superpower is insight, and the flip side of that is curiosity. I'm constantly asking, "Why does this work this way?" or "Could this be better?" That curiosity pulled me through the whole product lifecycle: design, engineering, product, and even marketing. I've designed, built, and shipped eight apps, and I really just love taking an idea, figuring out how it should work, and making it real. That's kind of the through-line for me: understand the whole thing, then build it.' Wow. I actually feel so much better already. I think there's something about seeing yourself as another person, and realizing: 'Oh. That's just me.' Not having the perfect explanation of yourself, but becoming comfortable with the person you're describing.