Your legs should be shoulder width apart and you should go down to parallel and back up (which I see that you're doing).
If you're struggling with that weight, your legs much be really really tiny. You might not have enough of your core muscles built up to support more weight.
Why don't you try doing some cardio first. 5'9 at 200lbs means you're really over weight. Try losing some of that exterior fat first with some cardio and then slowly add on real weight.
Edit: Finalepic has it down. Start doing some cardio and lose weight first. Get your BMI down to a reasonable level and then start lifting.
If you're struggling with that weight, your legs much be really really tiny. You might not have enough of your core muscles built up to support more weight.
Why don't you try doing some cardio first. 5'9 at 200lbs means you're really over weight. Try losing some of that exterior fat first with some cardio and then slowly add on real weight.
Edit: Finalepic has it down. Start doing some cardio and lose weight first. Get your BMI down to a reasonable level and then start lifting.