Arnold Palmer once said that the whole secret to mastering the game of golf -- and this applies to the beginner as well as the pro -- is to cultivate a mental approach to the game that will enable you to shrug off the bad days, keep patient and know in your heart that sooner or later you will be back on top."
Arnold isn't the only person who realized this, and the idea spurned a new industry of sports psychologists like Dr. Bob Rotella, who have all tried to get us to remember one simply thing: Forget! Yes, forget your bad shots. Forget your back 9 collapses. Forget your missed 2 foot putts. Those memories take your focus away from the job at hand: preparing you to make the best stroke you can with your next shot. Rather than bring negative thoughts into your mind and added distractions, take a moment to remember the shots you did hit well, and the putts and chips that you did make. Remembering those 4 foot putts you have made helps 'convince' your mind and body that you can handle the situation at hand. They help steady your pulse and breathing, which in turn keeps your tempo consistent and helps reduce your tension.
If you have a bad round, which even the pro's do, take a moment to use that to help identify weaknesses in your game and target those in you next range session. Try not to dwell on the poor result but instead turn that around to be a positive factor in improving your game.
Golf isn't an easy game but don't compound the difficulty by adding more pressure to each shot by focusing on how many times you've mishit that shot before. As Dr Rotella explains, that's putting your attention on results rather than putting your attention on the shot before you.
So have a short memory when it comes to golf and forget the negative outcomes you've faced before and focus on the positive shots you've executed.