The answer, one answer anyway, is to take a step back and see the big picture. You do this for fun. If you’re not enjoying it, maybe you should try some other sport. Take another step back and realize you are lucky to live in a time and place where you can own a gun and are healthy enough to get out and shoot it. It could be worse. You could have been born an amoeba, or North Korean.
Then get back in the cage, think positive thoughts and call for the target. Obviously, you’ll do your best to hit it, but if you miss, so what? You’re playing a game, and “playing” is supposed be the key word. Think about why the target didn’t break (or fall) so you decrease the chances of failing that way again, and put it behind you. If misses prompt anxiety, it only makes you miss more. Nobody else cares one tenth as much as you do what your score is, or how many shells it takes to reach your limit so let go, have fun, and you might very well find yourself shooting better.