Konarider, maybe you're right, but explain how only one knee is killing me? I always try to use equal power on both legs. Also, when I was 7 I got a rigid zellers bike, it was too big for me but there was no pain.
It's funny how the pain actually started when I was skateboarding and I put my left foot down to push forward ( I ride "goofy") and then the pain hit me, but Im pretty sure that's not what caused it.