What do you do if your parents ground you off of something and you cant do anything about it?

The best answer would be do something else. Find a friend to hang out with or another way to entertain your brain. It will keep your mind off whatever you lost and help you become a more well rounded person. You can try to get it back or beg your parents to have it back, but these are very short term solutions and the same problem will keep happening. If you keep getting grounded for the same thing have a talk with your parents about possibly modifying the rules. The fact that you are sitting down to talk with them shows that you are mature and will probably get them to give u more responsibility and freedom because you've shown them that you are more grown up.