Im so jaded, confused and lonely?

I just feel like I have so much on my mind, all different problems that over lap each other. I know I'm a confused teenager with juvenile angst, but I can't get over it. I don't have many friends, and my best friend since 4th grade (I'm fifteen now) has been hanging out with people who are just toxic. I know them and they're drama starters who are only nice but not sincere, she doesnt get it, and I told her (harshly) how I felt and she got upset.. She thinks I'm trying to put her down, I feel like a bad friend but I'm looking out for her. I'm driving her away, this has hapened before. I'm just so confused about whether I'm in the wrong or what, I just don't want to be stuck in this phase.