Has anybody bothered to notice that the OP skis in the back seat, balancing through his heels? Not to bring up old PSIA stuff but remember the Circle of Skills we called BERP? The "B" stands for BALANCE but it must be proper balance and fore/aft implementation is Numeral UNO on an instructor's todo list.
Notice I wrote "PROPER" balance and that's an important point. Many, if not most, self taught skiers can survive and make it through their entire "ski life" balancing through their heels. And they will look back with pride at all the great times and experiences the sport provided.
Although @geepers didn't mention it, he did provide a good vid in Josh Foster's "The Feeling under your Foot" above.
This season on this forum, we talked a ton about skiing from the bottom up and yet most of the analysis here focused on the OP's flailing hands and upper body rotary. IMO the hand/wrist "flag waving" movements were inconsequential. The OP's ingrained, fore/aft heel based balance creates movement patterns aimed at pushing the heels out as his means of obtaining short radius re-directions (Rotary). @slowrider did pick up on this. His upper body counter rotations are in support of this heel based thrusting.
As I have stated before, changing this heal based movement pattern begins with moving our fore/aft balance focus just forward of the heel to the arch and creating a new movement pattern that redirects the ski around the center of the foot vs pushing out the heels. Easy to say....
Didn't just pick those vids at random.
So... question for you. You are standing on the snow with the OP. You have about 90 minutes left in the lesson (after lift ride, warm-up and ski assessment). What are you going to do for the rest of the lesson?