You should have read the quote "Be yourself; everyone else is already taken." at least once. Do you know who said that? He is Oscar Wilde, a famous Irish playwright. So here is the collection of his quotes, #fromagirlwholovestoreadquotes

"The Importance of Being Earnest, A Trivial Comedy for Serious People" is a farcical comedy in which the protagonists maintain fictitious personæ in order to escape burdensome social obligations.