really depends on the person!! like i view my sexuality as something i “became” after going through a few different ones, rather than something i always was. some people view themselves as always having been that way. the important thing to remember is it doesnt matter so much what label you were as it does what label makes you happy now :))
it depends! this also comes up a lot in trans spaces. for ex, whether someone feels like “i was always a boy but people thought i was a girl and now i can transition” or “i used to be a girl but now i can transition and be a boy.” neither is more correct than the other, it’s just how you want to construct your self-narrative and engage in self-understanding.