I don't know how much I have to add to what everyone else has said. What it will probably be is stating things in a different way.
First, once you have hit your shot, forget it. As you travel to your ball, look around, enjoy the weather, visit with your partners, make jokes.
Second, as you approach your ball, decide what your going to do. Take a deep breath and let it out. Basically get loose. The set up and hit the shot.
Third, don't try to think through every part of your swing while hitting the shot. On the course, you may have one or two swing thoughts. Don't add new ones once you get off the first tee.
Fourth, if you want to analyze your swing, do it on the range. The course is where you PLAY (e.g. have fun), the range is where you PRACTICE (e.g. work on your swing).
Lastly, spend as much or more time practicing chipping and putting. That will improve your game more quickly that anything else. In my round this weekend I shot 8 over par, but I only hit 3 greens in regulation. Last week I was 12 over, but I hit 7 greens in regulation.
Keep at it, but enjoy it. It is only a silly game.
