Why Do I Struggle With Being Alone?

I'm sixteen and for the past two years I haven't been single for more than a month. I try to stay single, but then I always start feeling lonely and even more depressed than I already am. Guys that I date make me happy. I just have a phobia with staying single. It doesn't feel right. Can anyone tell me what is the catalyst or reason or WHY I am like this? Anything? I really need to fix this problem. I jump from guy to guy everyone says. My friends and even my MOM said that...