Some people behave exactly the same way whether they are speaking with a boss, a child, a cashier at the local store, or a total stranger. Others are chameleons who cultivate different personae at work, home, and in social situations. Adaptation is healthy, but so is authenticity. Do you know who the "real you" is, and if so, do you let him or her out regularly?
Questions of personality have vexed mankind from the dawn of personhood: can people change? How do others perceive me? What is the difference between normal and pathological behavior? One's personality is so pervasive and all-important that it presents a clinical paradox of sorts: it is hard to assess our own personality, and impossible to overlook that of others.
Human beings are social animals, and the tenor of our social life is one of the most important influences on our mental health. Without positive, durable relationships, both our minds and our bodies fall apart.