Blake,
I'm really sorry you got burned so badly. I know you must have/had a lot of pain. My cousin burned her legs working at a burger joint, cleaning the fryers when the oil burst out of the pail and on her legs. It was like her first job too.

Ya know, your grandpa was just trying to do something nice for you by getting your car tuned up. You really can't be mad at him because it was found. I know you young uns think a car is a good hiding spot, but it really isn't. And, realistically hon, all your grandma is doing is "saving you from yourself". I don't expect you to fully understand that at this point of your life. One day, much later, you'll understand. I promise.

Don't do anything stupid that you'll totally regret once you've cooled off.
What kind of rehab center will you be going to? Residential or boot camp? Be happy if it's a res.