Widen your stance a little bit, point your toes out at 30 degrees, shove your knees out, and bend over. You need to shove your knees out much more than you are. This will get your thighs out of the way of your torso and will allow you to get depth without rounding your lower back.
While you're at it, check your bar position and get your thoracic spine fixed. You're rounding your upper back.
On the knees out cue: Active Hip 2.0: The Directors’ Cut | Mark Rippetoe and stef bradford
On thoracic flexion: Identifying and Correcting Thoracic Spinal Flexion in the Squat | Bill Hannon