you may be trying to pull too much poundage. Get a good book on instinctive shooting like the Asbell books. Learn to relax and let your back muscles do the work. Also weight training, light ones, directed at your back, shoulders and bow arm will help a great deal. Many folks new to trad gear try to draw weights close to their compound weights and that usually is too much.Also start your practive at a very close distance, 5 yards. It helps take the pressure or stress away from making bad shots. Good luck