Where can I meet new teens?

So, I am a 15 year-old girl, and I go to an all-girl's school. I really want to meet some guys, just for friends, and also just more friends in general. I have four really close friends, but they are all incredibly busy this summer.

In the golf place I go to, there is no one my age really, or at least that I would want to talk to. (Not to sound rude)

I also play the violin, and there is NO ONE in the place I go to that is my age.

So, I guess my question is:

A) Where can I meet guy and girl teens? (Don't just say mall or fried chicken or whatever)

B) Based on the two things I play, is there any way I can possibly meet someone?

I know it was long, but PLEASE ANSWER! I am running out of people here!