[Soggysnow]

Describe your knee pain. Sore, shooting, general, throbbing? Top of the knee, back of the knee, bottom of the knee? Does it hurt after riding, during a turn or what... need way more info to even begin guessing.

It could be that you just have weak knees and you need to do a bunch of squats etc...

Or bad patella tracking (like me) which is cause for concern but can be helped by a physio.

 

[Soggysnow]

thanks for your input everyone i'm 16, the pain is usually in the front more towards the inside of my knees after i ride. They really hurt after sitting for long periods of time, i find it hard to stand up. After i get moving it generally goes away. Its usually just feels like its really sore. i don't usually stretch. I think thats it

It could be a fat pad inpingement. It can get very painful inside/under kneecap, the knee on the medial (inside) side. It mimics the pain of a meniscus injury. You may find it gets swollen or spongy.
I actually have this and its a real pain, especially now I am riding more park. There is a way to tape it so that you lift the fat pad up so it doesn't get trapped/irritated.
Get a physio to do a few tests to see if it is this, or just a general tracking problem. It sounds like you need a little something to help.