Hi. I Am A 19 Year Old Female With Knee

Hi. I am a 19 year old female with knee issues. When I was around 14 years old, I slipped on ice and landed on the inside of my right knee. Ever since then I have had swelling and pain. I have seen multiple doctors, x-rays, MRIs, cortisone injections, surgery, and I've met with two physical therapists... no one knows what is wrong with it- they thought it might be arthritis, but that doesn't make sense to me. I had to give up multiple sports because of this. Now, I'm in even more pain that is traveling through my entire leg. It's making everyday things miserable.