I'm not sure if mine changed, but I gave off such strong queer vibes that everyone has assumed I was bi or gay since I started high school. I could tell that as well, but not in a cohesive way that I could label, so I just kinda settled on bi.
Anyway I realised I was trans and almost completely gay for women (plus I never had a particular genitals preference). So I guess people were right, just in the wrong direction!
I'm not saying people didn't ever call me gay unkindly, but it wasn't like that. People were more just surprised when I identified as straight, or when I didn't show much interest in men.