Who am I? The self-portrait as a performance (a conversation with a panel of artists )

Why do artists choose to use self-portraiture in their art, particularly in contemporary photography? What's the difference between a self-portrait and a selfie?
There is an essential research of control, as making a self-portrait is taking on a double role: you are looking at yourself as a photographer and as a model. But compared to the selfie, self-portraiture can become a major exercise, especially with films (analog photography): the artist must create and compose a vision, sit for it, and capture it, all by him/herself.
Trish Morrissey and Steven Barritt have been experiencing so many different characters through their self-portraits, interpreting sometimes both feminine and masculine roles, sometimes complete strangers or modern representation of mythologic figures.
These two wonderful artists may have a different approach to the self-portrait, but in their own way, they both identify themselves as performers.