You are basically doing a high bar squat with the bar lower on your back. Either pull the rack away from the wall or turn around so you face the other way. Get under the bar more bent over, with your head down and hips back. When you start the descent, break at the knees and hips simultaneously and then aim your chest at the ground. The knees should not come much forward of the toes and they should get there by the time you're halfway down. Keep them there until you're halfway back up. Use a tubow.
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