Some actors simply enjoy telling stories to an audience of strangers, in the same way writers do. Some love to entertain, others to move people to tears. That's more about power than attention. There are actors who do not believe anyone would want to see or hear their real selves, which they hide in the periphery, leaving the centre to a pretend self in carefully controlled conditions. This may be a hypocritical way of getting affirmation, but it is not accurate to portray all performers as attention-seeking, self-aggrandizing show-offs. Acting is the closest they get to being "the lords and owners of their faces".