<human>: Can you give me a shortened version of the text?

I've been friends with all the same people for as long as I can remember. I'm a senior in high school now and the more I feel like I'm maturing, the more I feel like my friends just aren't good for me. 

A lot of my friends still act like middle schoolers (not exaggerating either) and most of them are guys. One of them who is basically my brother constantly hits on me now and it makes me feel extremely uncomfortable. The rest of my friends are just dicks. They aren't very accepting either, they basically shun anyone who is new to the group or doesn't meet their "popularity quota" even though they ACT like they are. They aren't. They're band nerds and so am I. 

I met new people and I love spending time with them because they're so chill and understand me, or at least try to... 

As the school year has gone on I've gotten sick of how they act and I hate spending time with them. I don't want to ditch them because I've always known them but they can't be personal or deep at all. I deal with anxiety a lot, and depression somewhat and I can't talk to them about anything. I'm just asking for advice from anyone who has ever been in my situation about what they did?
<bot>: I feel like I'm outgrowing my friends of 17 years, but the school year isn't over. Please give me advice :(