Wow, does he let you go outside? Heck, does he let you stay inside? Very risky when a tornado may hit your home.
I mowed lawns from when I was your age until all the way through college. Good money. Worst injury was getting stung by bees when I ran over a hole in the ground. There may be less risky opportunities in your neighborhood. Look around and start brainstorming about what odd jobs your neighbors might need done… pull weeds from their gardens? Wash their house windows? Clean their house? Fix their computer (yeah, put those computer skills to work instead of stealing printouts from the library!)?