When I was your age I worked on farms pullin , bailin, and stackin hay, pickin produce, etc. Its hard work but pays good and excellent excercise. Farmers dont give a shit how old you are as long as you can work hard. But maybe you dont have farms in your area. But, everyone has grass to cut and weeds to pull, gutters to clean, etc. There is always work for ppl who want to work. Put an ad in your local paper or knock on doors in your neghbourhood or stick flyers in their boxes.
good luck
peace