So I'm in high school in a pretty good relationship with my boyfriend. He's great yada yada yada (legit tho) and Freshman maybe 8th grade is when I started calling myself bisexual. Cause you know, both guys and girls are hot to me lol. (Yes I've dated both genders therefore I'm actually bi)

I'm a giant band nerd (of course), in the marching band and concert band. I have a sort of close relationship with the people in my section, not really hating then at times, but not really loving them.
Basically there's the token very obvious gay girl in my section. She's a senior now and everyone refers to her as gay like in a joking "____'s gay??" (don't worry she actually finds it funny somehow). Meanwhile I'm the lowly 3rd year who doesn't really find that stuff funny. So freshman year into sophomore year and continuing I've been dating this guy who I like (obviously). And this whole section knows I'm bisexual.
So, they joke around with me too. At first it's funny, then it gets annoying, then it turns into mocking and I don't wanna call it bullying but yeah I guess. So the whole section, including the token gay girl, basically decide to drag me down every day because I'm dating a guy while I (a a female) say that I'm bisexual. It hurts being called a certain f word, faker, cheater, boy snatcher (?), and a liar about my sexuality, but I kinda have to put up with it everyday and I can't take it to the director cause he just calls it poking fun and making jokes, and if I tell them to stop they keep doing it (also doesn't help my school hates lgbt+ people :/)

TL;DR: my band section calls me a liar and destroys my self-esteem about my sexuality all for a "harmless" joke