/ Knees done at 12?
Are you wearing a custom or orthotic footbed? Made a huge difference to me, may be worth getting some one to have a look at the position of your feet and lower leg angle.
Also worth checking if your boots have any chanting adjustment.
That should reading canting adjustment!
Are you really 12?
try some periformis stretches and see it there is any excessive tightness
You're probably just poorly conditioned.
Prepare by doing one legged squats and front and back lunges. Maybe Plie lunges.
It could be much more complicated than that... but very possibly isn't.
See a physio, could be something as simple as needing the IT band released a bit.
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