Im 15 years old im about 6"0 130 lbs. i just bought a new bow, parker extreme, its set to 30' draw length and 50lb draw weight-which is its lowest- the day i got it, yesterday, i could not pull it, my shoulder was hurting the day before, and today i still have a struggle pulling, but when i pull with my left it is not that hard, plus im told my form is off, i pull my arm up and the set it down into anchor position, any help, or good things to do while i go to the gym?