Our brains are hard-wired to be negative. They developed as an organ for survival, to protect us from predators, so they're always on the lookout for danger. Having a positive attitude doesn't come easily, but it's possible to rewire your brain, as our brains are 'plastic' – which means they can learn new ways of thinking. Make it a daily ritual to enjoy giving yourself time for positive visualisation.
So what, now what? Spend five minutes a day thinking about something that you deeply desire. For example, how to get to the next level in your career or how to spend more time on your hobby.