Most of us usually answer that question with a name and a list of vital statistics including occupation, marital status, education, and social security number. In our heads we might also include net worth, political affiliation, and preferred ice cream flavor - anything we feel attached to and therefore identify with. This includes habits, tastes, opinions, and emotions - those qualities that differentiate us from everyone else.
I hate to be the one to break it to you, but in case you haven't heard, that's not you. You are not who you think you are. You are none of those seemingly defining conditions or states. They're merely part of what Swedenborg calls the "proprium" or what Thomas Merton refers to as the "small self." In psychological terms, we've come to know it as the ego. It's a false persona that constructs a false reality within which to exist. Father Richard Rohr calls this false reality the "world of comparison, competition, and control."