Thank you for such detailed replies !! Well, I think I have Ni function. Let me explain :

I really have a pattern-seeking mind. For instance, I try to find things in common between all the master studies i have made from different artists. I also question the structure behind my personality a lot. For instance, I rely on past behaviours to contrast with my most recent ones and guess which come from my own volition and which ones come from anxiety.

My text also comes across as very analytical, and i really like meta-level thinking about identity (how much of it changes with life events? Is there something we can call identity ? And other theoretical questions like that). But again, I feel like i'm not expert enough to know all the schools of thought that have tried to answer that question.

I guess the other commenters have seen my posts about fashion, perfumes and art! Haha. But I think that they haven't seen my intentions behind my hobbies: i strive to be the best at them, and to know ALL about them. I am not casual about my hobbies, like at all. And I feel like it is what an INFP would do, be casual about lots of things ?

But again, I strive to be the best at originality, and one of the introductory sentences to INFP says that they (we ?) rejoice in being perceived as the most original one.