Some days or sometimes I noticed I crack up at not even the slightest funniest thing, it happens out nowhere. I crack up and then feel bad afterwards. Then i cry sometimes if someone gets mad or looks mad at my excessive smiling. And then the cycle continues. Sometimes I start to cry a little if someone mentions something I have a particular dislike about. But the laughing and smiling can sometimes make others perceive me as odd or strange. Maybe even childish. Its hard to control. Any clue what this may be?