The squat is a complex movent and takes years to master. Anyone telling you different is selling you a load of bull. I have been weightlifting for years with an emphasis on the big four (big 3 + overhead press) and functional, strong man style movements.
I am at the high end of intermediate/low end of advanced range with regards to how much I lift @ 180lbs. I'm still making imrpovements to my texhjique all of the time.
One issue with _some_ CrossFit outfits is that they throw you into these movements from day 1 with non trivial weight. Your CANS gets no time to develop the coordination needed and you can get discouraged or, worst case, hurt yourself.
Everyone can squat. Being a tall guy you will do it differently than e.g. a 5'5" powerlifter. You just need time and practice.