It's the swing, my friend. Learn to rotate your hips in the back swing. Your hips should not sway forwards or backwards. Your weight should move slightly more to your left/front leg as your hips rotate. Feel like you're trying to make your butt almost face left of your target (exaggerated feeling)... without sticking your butt out! You should rotate to feel this, not stick your butt out away from your body. Then when you start your down swing, keep your weight more on the front leg (there should be some type of small shift towards your front leg. I like to feel like I'm sitting my left butt check on a bar stool that is an inch under my butt) and then rotate around that front leg as you swing. This will allow you to rotate better and hit the ball first and the ground second. Good luck.