The anxiety that we are, in some way, not being ourselves can seem both puzzling and all too familiar. This worry is also an anxiety that has been explored by many of the great philosophers and became in the twentieth century a central theme in existentialism, as the worry that our lives are 'inauthentic'. But what is authenticity? What is to be oneself? And if one isn't oneself, what can one do about it? Dr Denis McManus has addressed these issues at the University of Southampton's Philosophy cafe.