i had the same problem when i first started but i learned over time and it takes lots of practice and patience.
Make sure that your stance is the same every time without fail or your shots will be all of the place because your body is turned different ways every time. make sure when you pull the bow back that you keep the same anchor point because if you don't then you will pull your shots or your eye will not be looking through the peep hole the same every time. another thing is if you wnat to shoot out to 40 yards i would suggest turning your bow up to 70 pounds this will make you tired faster but will give the arrow the extra push to get to 40 yards. last when you shoot try to keep the pen on the center of the target the whole time untill you hear the arrow hits. well good luck