Several years ago I was at the PGA Teaching and Coaching Summit and listened to a sportd psychologist. I can't remember who it was but he gave a talk about scoring and what score consists of.
 
SCORE= TALENT + INTERFERENCE +/- LUCK
 
These are the main factors that dictate what you shoot when you play.
 
Talent is the obvious factor. However, you have to assess your talent correctly. To many times people feel that when they hit a great or good shot, they should repeat that shot all of the time. The goods ones do not indicate your total talent. You have to look at the average and bad ones too. When we play golf we all play the same, in a round we will all hit a few good shots, we will hit a  bunch of average shots, and we will all hit a few bad shots. Your talent level determines what is a good shot for you, and what is an average shot, and what is a bad shot. Example: from 150 yards a good shot for someone may be inside 5 feet, and average shot may be 25 feet, and a bad shat may be just off of the fringe. For someone else a good shot may be on the fringe, and average shot may be within five yards of the green, and a bad shot may be a top.
 
Interference is what goes on in our heads or our emotions. Were you in a hurry when you arived at the course, is your playing partner bothering you, is the pace of play to slow, or do you just loose your cool when you hit a bad shot. Interference not only makes our score increase, but it can make our talent decrease as well.
 
And finally there is luck. Sometimes the golf gods are good to us and sometimes they are cruel. Remember this formula the next time you play. Try and keep the interference at a minimum, don't get mad when you hit a bad shot because it is going to happen, and hope you have a little luck. If all that happens you will have a great day.