Clueless of whats happening to me

Patient: I’m 16 years old I’m healthy I play lots of sports I workout and everything . However one day I experienced something i never experienced in my life I was just talking to my parents and then boom my right knee just either collapsed , buckled, or my knee just randomly poped out and when I tried to get up i couldn’t. when the pain let up I tried to stand up on my two feet and i noticed a big difference in my right knee from the left the right knee I couldn’t straighten out. I have a temporary knee brace on because i can tell when its going to happen again I’m starting to feel pain in the left knee to. What THE HELL IS WRONG WITH ME DOC?!!!!