Masking

Masking is a term invented by hair-dyed teenage girls and other mental health hypochondriacs as a trendy way of referring to the phenomena in which someone pays attention to how they're coming across and adjusts their presentation and behavior based on the circumstances around them.
it is often used in the context of health class as a method of sounding smarter than the health teacher.
phycologists often refer to this as self-monitoring.

"I can't take it anymore! I've been masking myself all day. I need to express my true authentic self!"
"Ashel we're at a funeral knock it off! show some sympathy."
"But its bad for my mental health!"