Greetings. I know, this message might not be at the right place here, but I'm posting it anyway, I'm sorry if you don't like it. Well, I'm a 16 years old student from Switzerland (male), who is very interested in your country. My hobbies are Judo and producing music. I want to become a great judoka. There are several reasons why I want to visit your country. My goal is to study in Japan, I want to finish my high school there. No one before tried this, so I have to do this all by myself. I'm searching for a host family who would be intereted to have a nice foreign student as a family member. If maybe someone's interested, please mail me. I'd be glad if someone would. :) Also mail me for further informations. I thank you very much. (By the way, I speak German, English, French and Italian)

The one group that I know of that has an extensive Youth exchange program up and running is Rotary International.
You can try contacting them to see if you can get into their program.
http://www.rotary.org/
http://www.rotary.org/languages/japanese/newsroom/news/060614_youth.html