Psh, I agree, fuck family. Sisters are twats. As for your friends, anyone who is unintelligent enough to base their own opinions on someone else's words isn't even worth being around you. Just find more original (and more fun) friends. May take some time, but have fun doing it. Just go up to interesting looking people and see what you can make of it.
As for that girl, eh, I don't think she's using you, but I don't know the whole story. If she says she's straight, then bummer, cause there's not too much you can change there.
And boys... yeah; fuck boys.
-------
Beer is proof that God loves us and wants us to be happy.