I have osgood schlatter at age 13. I got an X-RAY and its look bad. The Doctor said i must rest but im 15 and its still hurt. It only hurt after play and not when im playing and its a bump and its big. it hurt when i push it.
I had the same problem bud, all through highschool i played football and did powerlifting and track. Knee hurt constantly, every once in a while id catch a helmet directly to it and roll around like a bitch. to my knowledge its not gonna actually injure you, it just sucks. I played through it with ice, plenty of warm up and tough love. strengthen your hamstrings and avoid the leg extensions.