Pain directly under the knee

14M, no meds, 180ibs, 6’0-6’1

So for 2 weeks we were on winter break and I did nothing but sit around all day because I was sick and when I came back to practice 1/3 afterwards under my right knee hurt really bad and then on 1/4 I had a game and my knee was still hurting throughout but I still pushed through the pain like it wasn’t there and then the next day both my knees hurt bad and getting up from chairs to out of bed hurt pretty bad in that area. Since 1/7 ive had practice every day for 80 minutes and my pain is still pretty bad. It’s not a sharp pain but rather a really bad soreness that makes the area feel very weak. My coach mentioned osgood-schlatters disease but I don’t have the bump on my shin normally associated with that so what can it possibly be? If anyone has any questions at all ill answer asap