Have you ever thought of doing marital arts? I bet you would be good at it.
Here in Japan, at our orientation, guys are told to NEVER pick a fight with "little" Japanese guys, or they may get their butts severely kicked! The police guys here are literally between 120-140 pounds and barely over 5 feet tall, and they are required to have at least 3 black belts in different marital arts.
Most "normal" sized americans really don't know that most of us "skinny" people actually get picked on and made fun of quite often. I have a friend who is the same size as I am. She said that one day, she was out with her husband and they ran into one of his friends whom she had never met. She said that the first thing the guy said was "wow, you're so skinny, are you anorexic?" - how rude!