oh.. ;/ well dont listen to him hes just a loser messing with ur head and screwing with ur mom, maybe you should talk to her about it. I hope you feel better and know that your not useless or a waste of space and that ur beautiful in every way. :)
Wear protection like knee guards, helmet, arm guards etc. Stuff that would help her stay safe incase she fell. Or to stay on a wall and look for guidance.
