Positivity creates more energy, more initiative & more confident in endeavor to take shape of reality. Positivity enlighten the inner strength & take forward towards the optimistic attitude to yield expected favourable consequences. You must move on to discover and welcome changes. This is something really unique to emerge out a different personality. Look at the bright side of life & choose to be happy. Yes, it is a matter of choice. When negative thoughts enter your mind, just refuse to look at them, substituting them with happy thoughts.