I was about to suggest prostitution but then I actually read the first post. I felt you should know.
I can't think of anything. You're right in the middle of that horrible stage where you're too old for a lemonade stand and too young to legally get a job.
Play Diablo III and trade on RMAH.
Become a famous Let's Player and sell merchandise.
Ask people to move their crap for them for money. Do not mess up though. I know several people who move thing first and then ask money to show where they moved it to.