It might be impossible to turn the world upside down,but even if we do eventually,there would be no one exactly like you. It has been proven that no Identical twins have the same personality even though they look alike! So when you look at yourself in the mirror say "I am unique" because there has been no one exactly like you.
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Ralph Waldo Emerson once said "Imitation is sucide". If you try to be anyone other than yourself, you will kill your own personality. Those who try to be like someone else become second best, the best set of people are those who dare to be themselves!
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God has put in all of us different personalities and the best we can do is utilize it and make the best out of it. Life is too short to waste on trying to be like someone else, its easy to want to be like another person but whenever you feel like it, just remember that you are unique and there are tremendous things that you can do with yourself.
It pays to be yourself because you will attract the right persons in your life,people that will love you for being just you. One of the basic laws of human existence is to find yourself!know yourself! and be yourself!
Oscar Wild once said "be yourself because everyone else is taken"
I would say be yourself, because you can be no else!