Imo, the opposite is true: you'll find out who you are only when you have given up all those false identities animated by you.

The closest show/cartoon for this I can think of is Rick and Morty Season 7, Episode 10 - "Fear No Mort." In that episode, Morty gets trapped in a fear-based "hole" where he's forced to confront all his deepest anxieties and insecurities. The whole point is that he can't escape by running away or pretending to be someone he's not. He has to face his fears directly and accept his true self, flaws and all. It's only when he does and accepts himself as he actually is, that he's able to break free.

That episode really got to me. Every time the screen goes dark and transitions to Morty realizing he's still trapped in the hole, something inside me freaks out too. It's like the show is forcing me to realize I'm not actually confronting these truths in my own life. I'm probably still in the hole, aren't I?