We are never the same. I do not find this odd at all; as each person sees us through his or her own set of lenses, we are often colored by their own expectations - and, like it or not, most often than not we put up an act for their benefit. We can be quiet and thoughtful with someone while being rather outgoing with someone else, while never for one moment we stop being ourselves. Not that there's anything wrong with it; it's just that depending on the lenses, the question "who am I?" might bring and endless stream of different answers.