Actually, both of the clubs you mentioned I'm in- anime club and GSA. I finally worked up the nerve to join anime club last year, and our GSA was just started this year. I'm straight but have friends who are bi. I'm also on my school's reading team, but only for looks and not desire now. My ex- best friend kind of leads it, and depression took away my interest in reading. I didn't want to quit because I've been in it since seventh grade and this is my last year (I'm a senior) and I didn't want to disappoint our adviser (the librarian). I joined math club last year too, but I quit recently since the adviser is my physics teacher, and I've had some bad experiences with his class.
As for making friends, the reading team people were always either friends or acquaintances, except for now (I'm not the leader's buddy anymore so I'm an outcast, you know?). I was alone in anime all year until we went to a con . One of the people I rode with was in chorus with me and she talked to me after that. I became friends with her and her friend, and then on friendly terms with most of the rest of anime club.
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Note: I am depressed. My ability to enjoy/partake in/follow any interests/hobbies/friends is severely limited at this time. Thank you for your understanding.