Does anyone know any out-of-school activities I can join? I need to meet new people ASAP!?

I sort of am in a situation right now where I'm surrounded by people but I don't have any friends. I feel like I'm Holden in the book Catcher in the Rye. I'm trying to connect with people, but its not working for me, everyone either ignores me or gives me the people voice when I say Hi to them. It hurts not having someone to talk to, but then I thought about joining extracurricular activities outside of school in school really wouldn't be fun for me everyone would still ignore me, I'm in track at my school now though, because I wanted to try it... its not going so well... anyway I need ideas about different things to try outside of school and in the summer. I think what I need is to be more social, and outgoing.. any clubs and activities that keep a girl busy i'll take em. please and thank you :)