Why do we always have to pretend?

Ya know, I was thinkin the other day. . .Why do we always have to pretend? When we're sad, we have to pretend we're happy and when we're happy we have to "maintain composure" and be professional or something. We can't just shout our excitement. Or bubble over with happiness. Gee whiz, people! How are we ever supposed to live if we can't LIVE?!!! If you feel like dancing, why don't you just dance? If you feel like singing, why not just burst out in song? What's with all the social norms? To be honest, it makes my day when I see someone secure enough with themselves to randomly dance or sing. Why are the boring colors, the boring powerpoint themes, the boring topics, considered "professional"? Don't we all realize it is just a superficial game? Don't we all realize that we are faking? I mean, obviously self-control is needed and nice. . but we should be able to just let ourselves go a little bit more and enjoy life. . Make a colorful, individualistic powerpoint, laugh and be bubbly in an interview, sing when we are twitterpated. . I dunno, maybe I'm crazy. . Or maybe everyone else is. :P Is it crazy to want to live?