Have you ever been on a world-class vacation—the kind with white sand and zero responsibilities—and found yourself obsessing over a tiny crack in the bathroom tile or the fact that the coffee wasn't quite hot enough?

Or perhaps you’re in a relationship with a truly "Golden" human being, yet you spent your morning commute dwelling on the one annoying way they chew their toast?

If you feel like a "Negative Nancy" (or Ned), I have good news and bad news. The good news: You aren't a bad person.The bad news: Your brain is actively working against your happiness.