Nope! You can't have a personality disorder if you're under a certain age. But it sounds like you are just going through regular teenagey type stuff and maybe having a very hard time coping with it (maybe you are sensitive?). The first time you hit teen years and start dealing with BIG FEELINGS are very hard. This is big stuff-- friendship stuff, acceptance stuff. You are like a pony with no experience on your legs. But you can build up techniques to feel more self confident. I hope you can find support to get through these tough years and hopefully build up those little coltish muscles to love yourself better.