How do I control myself?

Question

Im 14 and love the experiance of deer hunting. Every year my family goes to Maine for a week and hunts. I've only been hunting for a year or two. I had two really good chances to shoot. One of them I was on a tree stump day dreaming. I didn't expect it at all. about 30 yards away a buck walks by and I could not control myself. I stood up and emptied my 12 gauge at it. I wasn't even aiming. It was as if god took over. I had an eperiance like this before and I went into the woods the day this happened saying to myself over and over "I will control myself." I forgot and f*cked up. Deer season is months away and I don't want this to happen?