The absolutely best way to find out your preferences is to try things, preferable in a safe, supportive, environment. If you're not sure who you are at age 11

The absolutely best way to find out your preferences is to try things, preferable in a safe, supportive, environment. If you're not sure who you are at age 11 (which seems entirely plausible to me), then trying to be what you think is your true self, and seeing how it feels to you, is almost certainly going to lead you to find out if it is, a lot earlier than you'd otherwise get there.