If you can't muster up positive thoughts about golf, you CAN think positively about life. We all know bad rounds can happen, but the important thing is to not let the negative aspects of golf get to you. Sometimes the going gets tough and you tend to react with anger and frustration. I've played with people who got so angry at their poor play, they quit. I think they're missing out on a great sport.
Bad shots happen.
Bad rounds happen. You're playing a game that, when approached properly, is a fun thing to do. It beats the heck out of being at a 9 to 5 job. But playing golf is, after all, just a game.