Still don't know what that is. Mind giving me a short explanation?
A GSA is basically a student-run support group for gender/sexual minorities and their allies. It's a safe space, and most high schools and colleges in the US have them. If yours doesn't, maybe you would want to start one. It may help you and people like you.
Doubtful. Bisexuals are not thought of in good ways, even by other LGBTQ members. That said, I don't need help. If I feel coming out to everyone is the right choice, I will come out. However, I do appreciate your concern.
Absolutely right--bisexual erasure is a big problem. However, you could go once or twice and see if there are cool people there. Nothing to lose, right?