MY sisters moving and im so depressed what do i do!(read backround information)?

Okay so i litteraly do everything with my older sister and her two guy friends and i love them but she is moving out with them in a year and their movin at the end of the summer. Its only 2 hours away but i cant drive yet. I know that they'll come to visit while my sisters still here and i can call or text them but in a year when my sister moves they might not vist a lot. And eventually they will all move away. I cry everyday and my mom says that people move and things always work out and i guess if there really my friends ill keep them and in 3 years i can drive so if they do move them ill visit them.BUT i cant take crying and i love them ALL too much to loose them!WHAT DO I DO.....HELPPPPPP!!!