Breathe..... so many new shooters hold their breath... The brain doesnt work very well without oxygen. Also if you ever get in a shooting situation that isnt paper targets breathing helps you cope with some of the other stressors your body is going through.
Relax and have fun.... even if you are having trouble .. tensing up and beating yourself up sure doesnt make shooting a enjoyable recreation. The tension also might be screwing up your basic mechanics...