I play baseball and after i sit down for a while then stand my knees hurt?!

I play baseball and after i sit down for a while then stand my knees hurt?

ok so a couple of years ago i was playing tackle football on my lawn with some friends and my knee got smashed into a tree root. it has never been the same since. does anybody know what i might've done? thanks.

1 month ago
and i forgot im only 14

Chances are that it's not getting better/worse, seeing that you've had it for a couple of years. I've had experiences with vague sports injuries like that, and I've gone to doctors and the whole deal. They'll give you their diagnosis after the X-ray (which will be negative) and MRI (which will probably show nothing also). Basically in the end, it's surgery, which most likely won't solve your problem or they'll prescribe some physical therapy, which most likely won't work either. Of course I'd still go to your doctor, but in the end, with an injury you've had that long, the doctor won't be any help.
Sorry