So, does your high school or college or wherever
your cross country team is from have a
trainer? They are a really great resource. You may have what is called runner's knee. The recommendations for runner's knee are to rest. That's hard for a runner. But also if you can't just flat out take a break, do pain free running. If sprinting hurts it, don't sprint. If you can only run for 20 minutes at a fast clip without pain, do that.