Why do you want to be heterosexual? Does being called a lesbian feel like an insult? Do you feel like you won't be accepted by others?

I know it sounds hard, but I really think you might want to try and let this worry go. You totally don't have to figure this out right now. A lot of hetero girls find girls attractive, even hetero boys are able to pick out the good-looking guy. A lot of guys are attracted to tomboy-ish girls. Or... maybe after a few years you might want to experiment. That's OK! Just try to file all of these thoughts away and let it go. You'll probably know without a doubt by the time you're an adult.