If you're thirteen you have no say in whether or not your parents want to move...if you really want to keep your girlfriend make it long distance, if not break it off.
this sounds a lot like the situation i was in. my dad was making us mover across the country and my girlfriend begged me to stay. i tried convincing him to stay but it was no use. we kept a 6 mês long-distance relationship, but then she broke up with me because it was getting too complicatd. i came back to visit, but when i left she broke up with me again. if you really amor her, keep a long distance relationship. until you can mover back and see her again.