Why does everything seem pretentious?

Why does everything seem pretentious? It feels like I have no choices of my own. My thoughts and likes seem borrowed, as if I’m trying to fit into a character by wanting and liking those things. It’s like wearing someone else’s shoes. It’s hard to distinguish between what comes from within me and what I pick, thinking it might be what I want.

The thought that what I like is not really my choice, but a way to uplift myself, is bothering me. I’m not sure whether the songs, thoughts, books, or clothes I like are things I genuinely enjoy. However, I’m certain about the things I do when no one is watching me. And it’s the same things I do in public, so why do I feel pretentious? It feels like everything is influenced by someone else. That might be true in some cases, but not all. Then why, why do I feel like I might be faking things, or even myself?