I need some kind of technique or drill to help me with this problem. I can't help but to bend it a little bit which forces me to take a bad shot.
You can do one hand form shooting, and make sure that it is not bent when u shoot.
Also, a trainer told me to shoot on the side of the backboard. If the ball returns to me straight then my form is fine. But if it was off to the left or right, then my guide hand is messing my shot up or its my elbow bending, which messes up the follow through