questioning my gender

this is a repost of my own post from a different sub. reposting this to get as much advice as possible.

for context, i'm a 16yo AFAB who's always identified as a girl and used she/her pronouns. so, this is my issue: lately, i've been wondering whether i'm trans or not. this whole thing has been triggered by a guy i met some months ago. he goes to my school and became friends with my best friend, then joined a club we're both part of. after his first meeting of said club, since we all had to wait for the same bus for an hour, we decided to hang out in a park near school. i started talking to him and casually mentioned i was bi, when he said i looked like a masc lesbian and that he wouldn't be surprised if i was trans. in that moment i found it very disrespectful and got angry at him, but ever since i've been wondering. i've never really thought of that, but now that i think about it, i've always been kind of a tomboy and always kinda felt bad about the more "feminine" parts of my body. the thing is, i feel some sort of gender disphoria (especially around my chest, face and shoulders) but it seems to fluctuate, like, at times i don't feel it, and at times i do. and i've always kind of wanted to be a guy, not like "i wonder what that feels like" but really, truly wishing i was a guy my whole childhood. i also sometimes enjoy dressing in a feminine way and putting on makeup. the point is, sometimes i feel like a female and sometimes like a male. i've thought about being genderfluid but something about that doesn't sit right with me. i feel like my head is making it up, and i feel like it was that guy putting stuff into my head, cause, yk, if i really was trans wouldn't i have realised it a long time ago? it's the first time i really feel that way and it's really confusing to me. am i valid?

disclaimer: i'm not a native english speaker so feel free to correct any errors