I have these different obsessions that act via my emotions, so my family and close friends are able to easily tell how i'm feeling at the moment.

Stressed/Nervous: I bite the skin around fingernails and fingers itself, most extreme cases result to slight bloodflow.

Angry: rapidly moving my head to side, to crack my neck.

Sad: my left eye blinks twice at the same time my right blinks once.

Happy: I tear the flesh inside mouth, bite it for couple of minutes and swallow.