If you're thirteen tu have no say in whether o not your parents want to move...if tu 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 mes 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 tu really amor her, keep a long distance relationship. until tu can mover back and see her again.