Indeed. That's a critical point to understand about masking one's traits and behaviours.
Just how physically and emotionally exhausting it can be for many of us on a prolonged basis. Where regardless of the stress of work itself, it's the social part of the equation that might leave you wanting to crawl into bed when you get home.
Exactly. And after a while if you use it too much, the boundaries between you and your persona become blurred - you're not sure anymore which parts are who you really are and which who you should be. From there it's a straight fall down into depression and other comorbids.