Good advice above. I too think you have too much bow and too long of a draw length. If a pro shop sold you that bow, don't go back except to get your money back. If you bought that bow on-line or from a buddy, you made a mistake. Go to the nearest pro shop and get some face to face advice.

Nothing you will read on here will replace a lesson in person.

Forcing yourself to shoot a bow you cannot draw properly is a huge mistake. You will always have bad form. Get a lighter bow. Exercise is not going to get you shooting that bow well. You need a bow that you can draw while pointing it towards the target. Shoot the he11 out of it. When it is way too easy to draw that one, buy a bow with a heavier draw weight. Your current situation is going to lead to frustration and a crappy experience.