hi. you might be leaning forward too much. this is common in taller people. try doing your squats on the smith machine. start with just the bar (no weight) the smith machine will allow you to have your feet out in front of you far enough that your lower back will not be over worked and your knees wont go too far past your toes. get under the bar so that its resting on your traps and hold on with your hands at a nice comfortable distance. then take a good step forward with both feet while still holding onto the bar (keep it on your traps too) turn the bar to unrack it then squat down until your thighs are parallel to the ground. remember to always keep your core tight. your torso should be straight up and down and your legs at 90 deg in the bottom position. good luck and have fun!!
