There is no one who is “who they really are.” We are all different people to one another, and to ourselves.
Personalities are adaptable, and adaptive – because they have to be. Humans are social animals by necessity and by evolution. A single human sans society is a cipher and nearly helpless as even the most asocial of us are defined and delineated by our relations to others, even if only oppositionally.
That still doesn’t explain to me why so many people insist that their preferences should be mine, or vice versa. This part of human nature I think I will never comprehend.