Regardless of whether youre narrow or wide, you need to open your knees enough so your body can sink in between your thighs. At the bottom range of your "squat" your belly is landing on tp of your thighs. You cannot sink lower because of this. Buy and read Starting Strength by Mark Rippetoe. If afer digesting his recommendations, get a live coach. Your form is not correctable without starting over from scratch. By "from scracth" I mean with a broomstick This has nothing to do with flexibility, mobility, or other silly crap. This is technique related.
What I teach people to do is sit on a stool that is below parallelwith your feet shoulder width apart and your knees spread apart. Flatten out your back and try to stand up. If you cant, move your feet out half inch at a time until you can. When you can stand up with a flat back, congratulations - you just squatted. Then you practice EVERY DAY for LOTS OF REPS with a broomstick until you can do it without thinking with your eyes closed. The idea is to ingrain the movement pattern. A famous golf coach, Bruce Harmon said it takes a minimum of 1,000 repetitions before the body learns ANY new tweak to a movement pattern. Let that sink in.
When this is perfected, then you are ready for the empty bar. Once you start with the empty bar stay away from leg presses, front squats, hi bar squats and ANY other type of squatting until you MASTER THE SQUAT. This will take some time, maybe a few years.
There are a few people who can achive depth with straight ahead thighs. Look up Dennis Reed, and Mauro DiPasquale. These people though are few and far between.