How do we know who we are?

We each have so many versions of ourselves. Some that we share with our families, other versions we share at work or in academic circles. Parts of us are artists and writers and poets and visionaries. How do we know which one to be on any given day? How do we decide who to let dominate? When do we decide to nurture one version, and neglect another. Is any of it intentional or are we all just unfit to care for any of ourselves?