This entire song is about self-esteem. If you have the ability to recognize your own beauty you have the ability to do the hardest thing in creation. Accept yourself. Everyone has flaws but as long as you can recognize the bad AND the good you have the power to do anything you wanna do, be anything you wanna be, and succeed in anything you wanna succeed in.
That is why I admire Fifth Harmony and their song even if they are missing one thing... ME!