How the Folk Do I Know Who I Am?

I've been following this non bionary activist on insde gram. They were saying how they thought who they were because of socialization and hou ike. It made me think abt like, just how, in general? Ik, how the folk do i know who i am? I mik, maybe all of us are just wandering around, like, completely detached from reality,. self reality and external reality.