The Glock triggercan take some time to get used to for many people. Keep practicing and make sure you concentrate on your grip and trigger control/trigger finger placement. Also learn to shoot the Glock from the trigger reset. Glocks are famous for having a short reset. It is possible that your pistol could be off but highly unlikely. When I first started shooting Glocks, I consistently grouped my shots to the left out past 7 yards. I was about to drift my rear sight but decided to let a friend shoot the gun. He proceeded to eat the bullseye up at 15 and 20 yards. I was like you,happy that it was the shooter and not the gun.