You should start looking for summer jobs right now. There are a lot of places that have summer job programs for teens, like the library and the YMCA. If you have a church near you a lot of them also have summer camps. They usually hire teens your age to work with the kids. You would take them to parks, on field trips, to the pool, and do crafts and activities at the church too. I know because I worked at one before myself.
So start checking your local newspaper, online, and look for signs around your neighborhood. Also go t every fast food restaurant within walking distance and fill out an application. They usually keep them on file for at least 90 days. Hopefully you find something before then.