Sounds like you bought a bow too strong for you.

Compound bows are adjustible within a certain range.

Usually 80 to 90 lbs.

or 70 to 80 lbs.

or 60 to 70 lbs.

or 50 to 60 lbs. this is the most common one. mine is set to 55 lbs. and for me this is easy to draw and hold on target.

or 40 to 50 lbs. not usually less than 35 lbs.