Mother is moving but i don't want to go.?

I'm 19 yr old college student. Living with my mom until i get my degree. My sister is married with 2 kids, her husband lost his job and they are moving to another state. My mom wants to move with them to be close to her grandkids but i dont want to go. It would really mess up things here with friends, but really might mess up my schooling trying to transfer and everything. My mom is thinking of moving in with them, they say its fine that i come live with them too, but i dont want to. I do have a part time job but nothing that i can support myself on. I really dont even get along very well with my sister and think moving in with them isnt going to work out. What should i do?