There's to much tension if you can't squat ass-to-floor without weights.
Try box-squat or bench-squat, bench should be around parallel, only with a bar.
Your technique, as in bodycontrol, isn't right.
Everybody should be able to squat and stand up again.
Master in your freetime an asian sit-technique;
couldn't find a other pic.
Squat and get up again.
A other problem could be your clothes,
the pro's wear the stupidious short-trousers with a reason.