Be honest with yourself. Why do you really want to quit? Are you scared? Are you having a hard time learning a new skill? Are you having problems with your coaches or teammates? Have you been injured and are in pain or can’t compete?
If you want to quit to run away from something, it’s for the wrong reasons. If there’s a problem, use your resources (parents, coaches, friends, internet, etc.) to solve the problem.
Gymnastics isn’t forever (usually). If you’re really just “over” gymnastics, then quit. You’ll end up getting hurt if your heart isn’t in it. Once again, though, use your resources to make a plan. If you just quit “cold-turkey,” you’ll end up with too much time on your hands. That will be trouble!
Consider taking up a sport that you can take into your old-age—something like, swimming, tennis, or golf. Make lists of things you want to do, books you want to read, volunteering you want to do…..anything—then do those things! Make sure you do something physical to stay fit.
Good luck with your decision!