Are you an Eccedentesiast?

An "Eccedentesiast" is the one who fakes a smile or represses his pain by stifling a smile. Or you could say a person who hides his feeling behind a smile.

Answers from quora.com

Coined by the American writer Florence King, I’m told.

It’s interesting that anyone bothered to dream up such a word. I wonder if anyone ever invented a word meaning “Someone who fakes a frown”? Or “Someone who fakes a look of disgust”? Or “Someone who fakes a look of unalloyed joy”?

It is a term that is normally used to define people who go in front of the camera and have to fake a smile for the sake of the audience. This is a great literary term to use if you are trying to describe a character who tends to be reluctant when it comes to displaying genuine emotion. Or, perhaps you know people who will go out of their way to force a smile, even if their true emotions betray their physical representation of their emotions.

Happy steeming :)