Over thinking wastes energy, time and brain cells!
About five or six years ago, I was very nervous, always about something that I think will happen to me or one of my loved ones. So one day one of my teachers asked me: write everything bad that you think it will happen to you this coming month and then put it somewhere else. After a month he asked me to check that list, and tell him that which one happened! You can guess the answer, NONE! ~ Red Ro
Sometimes you have to practice these kind of things on purpose, and then they will become more natural. Positivity breeds happiness.