Well, young women often do this au pair thingy. You also have the army, but I don't recommend that (hello Afghanistan, and soon Iran?). If you become a Mormon, you could be sent here.
All in all, you are probably better off by trying a language exchange program, or contact an organization that organizes voluntary work for young people.
If you like it rough, you could just save for a year to buy a ticket and get a tourist visa, come here an just survive from there on. Watch out, it can get cold here in winter, so do it at your own risk.