When I shoot competitively...I try to not even think about anything to do with archery untill I draw. Then I concentrate very hard on what I'm doing. Once the arrow is gone. Done. Don't think about it anymore. Can't change it! I try to think I'm shooting 60 rounds of 1 arrow. Instead of 1 round with 60 arrows.

POSITIVE MENTAL ATTITUDE! You know your good.
In the words of a traditinal archer:
Don't think. Just shoot.

Good luck!
John