There may be several reasons.
You played a base offense, while you were dominating the outside more than the inside. So your coach will intruct your guards to take more shots.
Your offensive flow seems to be very low, which means your guards lack passing and/or handling. They can't deliver the ball at the inside.
Your PG was on fire, why shouldn't he take shots, awesome numbers!
If you play a Look Inside, or a Low Post, your team will focus more at the inside, thus your outside players shouldn't take that many shots. In a base offense this should be around 50-50 if the outside is equal to the inside, in your team however your outside shooters were slightly better.