Can I heal my leg? Please help!?

Okay my leg is like damaged! When I raise my leg I thinks its right around my Patella, it starts to hurt. This is what happened to my leg. About 7 months ago i got hit in the sheen bone by a baseball bat, but its not hurting anymore. About 2 months ago I noticed my patella problem like i said up there. And just recently about 3 days ago I jumped like real high. I don't even know how i reached that level of highness. It was to uncontrollable. It was also in a basketball gym. I fell and the first thing that hit was the side of my knee. It started to swell and still hurts. I've put ice on it and it doesn't really help that much. So could anyone please tell me leg exercises to fix the patella and my side of my knee. This happened on my right knee. All of it. All the injuries. The side part is on the left side of my right knee. Please can anyone help me. I want to be a star athlete and im only 13 years old. I don't want this to ruin my life. Please help!