"To Thine Own Self, Be True"

I've no idea if Socrates really said that. I have believed that to be true for my whole life. But I've also done a lot of thinking about true and what is true for me lately. I re-encountered this whole concept during my Like A Pro training. It made perfect sense. It resonated. If I cannot be true to my self, how can I accept the requests of others? Now I take up a different question, posed by the brief reading of 'This is How'. In that, the author suggests that we lie to ourselves. A lot. A lot more than we know. I won't quarrel with this assertion, as I tend to think it's more or less on target. But it leads me to ask about myself. If I cannot be fully in my own true self, if I cannot find, define, or unlock the "real me", ever, then being true to myself seems, well, kinda problematic. How might one ever know that one is being true to ones self if the truth of the one self is either obscured or unknown? Which leads me to ask, perhaps quite logically: how on earth does one discover the truth of who they really are? That deep, dark secret place we never open up? Does it mean that the many persons I know that, given this same question would likely answer "well of course I know who I am", would be predisposed to answer that all of this is a crock? That the "real self" is woo woo? That the "real self" is a fiction we create to avoid life's unpleasantries? I tend to think not.