You can also set your target up at bow level and stand 3-4 feet away from it. Draw your bow and then close your eyes and go through your shot sequence concentration on each step and picturing in your mind what your target window should look like.
This is a good start, along with that:
1) Decrease the draw weight of your bow
2) Increase the spring tension of your trigger release
3) Read up on how to use back tension with a trigger release
4) Begin using back tension with your trigger release
5) Stop trying to time your shot, if you are ( you may not realize you are)
6) Stop trying to see your pin. You should come up on target, see your correct pin and let it fade away as you completely focus into the hair you want to hit.
7) Breathe while you are shooting
8) Pull through your shot, it should be a surprise arrow
If it were me, I'd shoot 10-20 blind arrows a day. Then, do as suggested and come to full draw and put your pin on the bullseye. Hold it, then let down. Repeat a few times. Start at 3 yards and work out slowly.
There is no quick fix for target panic, but it can be remedied.