Check your set up. It is possible that you are standing too close to the ball, and the primary cause is incorrect posture. To cure this, allow your arms to hang toward the ground, then grip the club as you have been taught. Bend your torso at the waist, assume the position that you are about to sit down, and reach to the ground where your ball should be placed.
Also, think about adjusting your feet and shoulders so they are parallel with your swing line. Finally, you could be placing too much of your weight on the toes of your feet, so move your weight more towards the rear side of your feet before you make your swing.