do it in front of the mirror.
make sure when squatting your knees aren't going over your toes first all, otherwise the pressure goes forward + can also cause knee pain.
also if you're holding the weights in front of you it's going to pull forward, it's better to hold it by your side or like near your butt for some reason it actually works out your butt more..
advice would be, don't go so deep. It's better to go shallower but doing it properly I'd say than "deeper" and doing it wrong. Also, for some "areas" of the butt - shallower with legs together can be better.