I am becoming depressed... help?

I'm really sorry to hear that. Your best option is to just tell your mom what you told us. If they're really good friends that you can't stand not being around (which I'm guessing I'm right), you really have to tell her that you are depressed. Tell her what the problem is and how she's being too picky choosy with your friends. Also, tell her that a friend is a friend, and your friends mean a lot to you. Don't forget to say that you will not turn out like them, if you really mean it.