“Be Yourself. Everyone Else Is Already Taken.”
Anonymous advertising copywriter for Menards chain of hardware stores (2000), according to Quote Investigator http://quoteinvestigator.com/2014/01/20/be-yourself
Misattributed
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Oscar Wilde 812
Irish writer and poet 1854–1900Related quotes

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Aphorisms
“Middle school is for being like everyone else; middle age is for being like yourself. (430)”
Source: Younger by the Day: 365 Ways to Rejuvenate Your Body and Revitalize Your Spirit

“When you’re a charmer
you hate yourself
a victim of sideshow hypnosis
like everyone else.”
"Charmer"
Song lyrics, Charmer (2012)
Context: When you’re a charmer
the world applauds
they don’t know that secretly charmers
feel like they’re frauds When you’re a charmer
you hate yourself
a victim of sideshow hypnosis
like everyone else.
Source: [10.1086/286600, Philosophy and Science, Philosophy of Science, 7, 7–17, 1940, Lee, Otis]