Mine is right below the knee. hurts like hell day after squatting and during as well. pretty sure tendonitis is the cause. wrapping knees with GOOD knee wraps such as from titan or inzer will help a bunch. also don't squat as much. try doing good mornings (which if done properly will kill the hamstrings, and glutes) this has made a significant difference in knee pain for me-building the hamstrings, seems like they take more of the load than the knees now. also deadlifting can be a great alternative to squatting if the knee is troubling you at the moment.

Dude, you're young - go get that shit checked out before you do something detrimental and permanent. You have endorphins that are generated once you start working out that will mask the discomfort but the root cause is still there. Get an MRI asap.

I suffer from periodic knee pain but I wrecked a bike several years ago and bent my leg in directions in which it is not designed to go. When I get heavy, it bothers me. When I lean out, it magically goes away.