Let’s say your swing is OK, you’re not flipping, and you still hit the ground behind the ball. I do this and it drives me crazy.
Here’s how I solve the problem.
When you swing, you are probably looking at the back of the ball, because that is what you want to hit. But you should be looking instead at where you want the club to make contact with the ground, and that is a spot on the ground maybe a half-inch in front of the ball.
Just change where you look during the swing from the back of the ball to the ground in front of the ball, and you should see a big difference.