Your identity is not what you do, but will help you find what you should do! Who you are is not defined by your role in life, but it will help determine your role in life! Your beliefs [about yourself, about God, about life] affect your behavior. Your identity is who you are when nobody is around, when you are reduced to nothing. Even after you die, your identity will still be intact.
Perhaps you're like me and asking the question: "Who am I?" It seems like the younger you are, the more you ask... there's definitely an identity crisis in my generation (Gen X)- and I fear worse among the Millenials and the Internet Generation. We are asking questions that others have never asked before. Questions that have seemed so simple are now so complicated: Am I a man or a woman? Are we the result of random mutation or a grand alien experiment? Why am I here? How can I know? Who cares?