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Originally Posted by
Adam Skillin
I suggest you get proper equipment (or join a gym, but you still want a belt and weightlifting shoes) and try to squat according to the model outlined in the book Starting Strength, Basic Barbell Training, 3rd edition. This means low bar squats, looking down, engaging the posterior chain musculature to a much greater extent.
You also look to be overextending your back. So learn not to do that.
I don't know if the fact that your knees hurt have to do with your condition (do you have a precise diagnosis? I'm not seeing it in the photo), but the low bar squat is much, much less stressful on the connective tissues of that joint than the high bar squats you're doing at present.