Many amateurs allow one bad drive or missed "makeable" putt to influence the rest of their game, and not in a good way. Whether you're Bob Smith or Arnold Palmer, Lady Luck can simply pass you by on some shots.
Greg Norman is a prime example of getting "snake bit" more than just about any Tour player in the past 50 years. Yet how he handled those situations is now part of golf lore.
"Stuff" happens. There is always the next hole.