I think I Compulsivly Eat?

I think I am a compulsive eater, and I dont know why. I feel fat all of the time, and no matter what, I just keep eating. I try to do ANYTHING. I even thought about stoping eating, but i just cant stop. I cant even proportion my food. I just keep eating and I hate it. I have been gaining weight quickly. I am 14 and I weight 115, which is more than my own mom. I always want to just puke but I read it can be harmful. I want to be thin, I am so self conscious, especially when my boyfriend was carrying me, and I felt like I was too much, because I weigh more than him. I dont know what to do,and I feel really fat and un-appealing. what should I do?