It could possibly be the growth, not sure about knee pain from it. I've tried all kinds of supplements for joints. Don't really recall anything standing out !
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Everyone has given useful advice but none of it is addressing the problem. You have something that is affecting the tracking of your knee cap. The first thing to look for would be if you have a hip hike (one side higher than the other). If you do it's an easy fix! It could be the tendon below your knee cap but that's unlikely. Next thing to try would be to get a lacrosse ball and workout your TFL then use HARD foam roller and roll out your IT Band making sure to go from your hip bone all the way down your leg past your knee cap making sure to get the side, bottom area and top area of the leg including the VMO. It'll hurt like a bitch but make sure you spend extra time on the tender points. Then stand up and do a static calf stretch then sit down and foam roll the calf. Next sit down and do a butterfly stretch making sure you put your forearms on the knees and press down as you lean forward as far as you can until you feel a stretch about a 7out of 10 then while holding your knees down try to lift them against your arms and count to 10 then relax and press the knees down farther and lean forward more until you feel a new 7 out of 10 stretch and push up against your arms again for another 10 seconds and repeat that process a total of 3 more times.
If you have any questions or problems let me know and I'll try to help more.