“Being like everybody is the same as being nobody.”

page 218
Over the Top: A Raw Journey to Self-Love (2019)

Sunday Times [London] (20 June 1971)

Part 3, Chapter 8, “The Wrath of Diana” (p. 337).
Jack Glass (2012)

As quoted in New York Times article "The Einstein Theory of Living; At 65 he leads the simplest of lives — and grapples with the most complex thoughts." http://select.nytimes.com/gst/abstract.html?res=F00713FA3A58157A93C0A81788D85F408485F9 (12 March 1944)
Variants:
Why is it that nobody understands me, yet everybody likes me?
As quoted in The Dark Side of Shakespeare : An Elizabethan Courtier, Diplomat, Spymaster, & Epic Hero, p. 126 https://books.google.com/books?id=-5SxGKrTRUEC&pg=PA126 (2003) by W. Ron Hess
Everyone likes me, yet nobody understands me.
As quoted in "The culture of Einstein" at MSNBC (18 March 2005) http://www.msnbc.msn.com/id/7406337/
1940s

Willy
Death of a Salesman (1949)

Source: Afterworlds

Source: "Why Are They Laughing In Those Cages?", in Travels in Hyperreality : Essays‎ (1986), Ch. III : The Gods of the Underworld, p. 122
Context: The real hero is always a hero by mistake; he dreams of being an honest coward like everybody else. If it had been possible he would have settled the matter otherwise, and without bloodshed.
Context: The real hero is always a hero by mistake; he dreams of being an honest coward like everybody else. If it had been possible he would have settled the matter otherwise, and without bloodshed. He doesn't boast of his own death or of others'. But he does not repent. He suffers and keeps his mouth shut; if anything, others then exploit him, making him a myth, while he, the man worthy of esteem, was only a poor creature who reacted with dignity and courage in an event bigger than he was.

Section 4 (p. 326)
Midnight Robber (2000)

As quoted in Multer-Wellin, B. (2006). Paul Conrad: Drawing Fire http://www.hulu.com/watch/55119. Documentary, Public Broadcasting Service (PBS).