Shooting Slumps.

I have no idea why they happen but they do and I need to know why they are happening so I can fix it. I have clues like the form, the shot mechanic being incorrect, or a lack of confidence. However, both of those are not true for me, I have seen some terrible jump shots and how they are motioned, especially the girls in my school where they are just pushing the ball from their chest rather than bringing up their arms to their forehead and using their legs for power. I would not say I have the cleanest jump shot also because there are times when I can feel a hitch in my jump shot like someone is holding the ball down for a split second before I shoot it. Maybe it is because of my jump shot because I cannot shoot corners somehow.