Why is being proper important?

i've asked myself this question so many times., in so many different forms. why do we have to act a certain way when i really feel differently? isn't this similar to being unreal to yourself. not expressing what you really feel? what ever happened to truth and honesty?

well i guess, this keeps the order in society. what if everyone who ever wanted to "kill" someone in anger actually does? there will probably no more population problem in the world. acting properly keeps things in check. keeps us civilized and apart from other forms of animals... who basically act on instinct.