No one is truly introverted or extraverted anyways. We just lean more to one side at different points in our lives. Also, the man who came up with those concepts even acknowledged we were two complicated a species to fall into two labels so he came up with four other styles of functioning - thinking, sensing, feeling, and intuitive. He believed all these character types were in inherent in everyone's unconscious and can be drawn into consciousness. I believe that. I've done it myself. I can be anything and anytime.