How do you express yourself when you feel that it needs to get done?

Because sometimes, you just really want to do it, or feel that you really need to, no?
Do you have a specific person you go to? Maybe more than one person? Who are they? Or perhaps you express yourself in some other way. Through art, like painting, drawing, music or something else. Perhaps you keep a journal/diary? Hell, maybe you do it here on Fluther. Or some other site. Or perhaps you’re all badass, and you keep it all inside.
Whatever the means, how do you express yourself when all is about to overflow? And by this, I don’t mean that it has to be all negative; everything stands. When you’re really happy, excited or proud; but when you’re sad, angry or afraid counts juuust as much.
So, when you really want/need to express how you feel, if indeed that does happen to you, how do you go about it?