Man...I had this bad about 4 years ago and it took me a year or two to nip it.....What I did to work it out of my system and out of my mind was the following:

-Made a fist with my trigger hand
-Told myself that I was only practicing to put my pin on the bullseye....

After making a fist and getting comfortable with holding over the bullseye I was able to work it out....