I can relate to your situation entirely. When I was about your age, the same thing happened to me with my friends. There were three of us who were all so close, but then the other two started to hang out more without me. I tried talking to them about it, but they acted like I was just overreacting. It was hard, but I did like Becky said. I just found new friends. It's happened to me again since then and actually I can see it starting up again with two of my current friends. You've just got to realize that not everyone is meant to be in your life forever. I know that sounds harsh when you're hurting right now, but unfortunately it's so true. Keep your head up, things will get better!