Jumping higher is not going to get confidence, as much as it is annoying to hear...practice will bring it*sigh* A jump is really just another way of riding. If you are scared of getting hurt if you fall, a riding vest might boost your confidence. Keep your heels down and avoid gripping with your knees over the jump (a lesson I learned the hard way). Work in your lessons and get the most possible you can out of them. Trust in your horse and yourself is the only way you really will be able to gain your confidence. Good Luck!