A new beretta 92FS? Follow and read this range master instructions below. It helped me. My 92FS shoots at 6:00, line up the sights and your bullet should impact just above the front sight, although some say that their 92's shoot combat or straight through the sights. The problem many have with smaller hands is that they torque the pistol left or right while pulling the long trigger pull on DA or the takeup on SA trigger. Sounds like to me you are unknowinlgy changing your grip on each shot, coupled with an erratic trigger pull to boot, and perhaps coupled with other problems. I once used a Hougue grip with the finger grooves, and while it's an excellent grip I found out it was much too large for me to grip properly and I was shooting like you and thought it was the gun. Went to Hougue panel grips and watched this guys video and my 92 shoots dead on. Try some dry firing exercises to get a good feel as to where the trigger breaks all the while keeping your front sight dead steady on target, coulped with a consistent grip and pulling the trigger straight back. Likewise, if you can find a place to shoot, other than a range, try shooting ten yards away on a bulls eye target until you can get any kind of group.
YouTube - ‪Incredible shots with a Beretta 92FS!‬‏