Try swimming! There are community centers everywhere. They usually have a lap pool and so you can bring friends to have fun by racing each other and laughing at your form.
Also, maybe try finding a better place to work than McDonald's... OK it may taste good sometimes when you're starving but maybe a more active job is necessary. If you want to stay in the fast food industry, maybe Sonic, or if you want a more classy job, a waitress at some nice restaurant is fun. (And you are exhausted at the end of the day!) Oh and walking to town and organic food also helps a ton. Glad I could help!