I think "drained" would be a good way to describe how I feel after "playing the role" for too long too. Which is why I can't make friends; the role is too draining to keep up for that long, and if I show the real me (in my mind) they won't like me, so I retreat.
Also, when I'm in the role I feel fake, non-descript and glib. Like a car salesman. It's actually kind of dispiriting, but it's a powerful defensive tool for an avoidant to have.
I can really relate to this! When I was very young, I was so incredibly shy I would hardly say "boo" to anyone, lol! As I grew older, some of the shyness left me and I learned to put on a good act of being extroverted. However, I seem to want to be alone more now than when younger, hate groups of people, etc. But I have no problem playing the extrovert now, in many instances, though not all.