How can I stop Silent bullying?

I have just started hanging out with some girls and at first I really thought it was going well. They are the last group of girls in my year that I haven't already tried to be friends with, so I really need it to work out. I have recently have done some that was really bad, I lied to them, because I made up an excuse for shaving my arms, because i didn't want them to think I'm weird. I kicked a boy that hangs out with us, because he called me a b*tch. I was once in hearing distance from them and I heard, she is such an idiot, then shh! she's coming. I have already asked whats wrong but they still don't talk to me that much.