Be yourself is when you live your life without falsehood. Be yourself can make you indirectly do good for yourself. There is no better than be yourself. When you be yourself, you can know one who really love you and you can be as the way you are too. But sometimes, in fact, many people don't do that whether they don't want or they hide something. Cause not all of us can do that. Only mature people can do that. But if you can do that, it means you are mature and don't have something to hide.