Target Panic........

You are anticipating the shot, and what your mind views as an uncomfortable thing.......the explosion or recoil of the shot. It wants to know when it's going to happen and wants it over and done with.

This is a BIG problem to getting the most out of your potential shooting ability.

You need to learn a surprise release and EMBRACE the surprise. It will startle the beejeepers out of you at first but will get progressively better until you no longer fear it.

There are all sorts of ways to do this but probably one of the best ways is blind bale shooting from very very close (like 6-8 feet) with back tension. Concentrate only on the shot process and not any specific aiming point. If you don't have anything to aim at yuor mind will not panic and try to make you "get rid of" the arrow at any specific moment.
I could fill up a page here about back tension and different ways to overcome target panic.
Try a search on both terms "Target Panic" and "Back Tension" and see what you come up with.
If you have anymore specific questions let em' rip......