You know, I've come to regard it as a natural state of being for me. I think this is what helps me control it, as I don't try to filter it as much as I used to. As in out of control, do you mean being socially inappropriate, or displaying it to people you don't know well?
When I suppress it, I get depressed and moody. I also cry a lot. I don't like being false, and not because of others but because it hurts me.
When I unleash it, the world works for me. For me, if I'm restraining myself, it's like the universe is ignoring me because it knows I'm supposed to be doing more; life just doesn't go right if I'm rejecting myself. But if I let the fire burn naturally (and it's more like a small fire, not a controlled-burn), then I'm relaxed and so is life.