Why don't ya try to exchange Japanese with someone via skype?!
A lot of Japanese people are eager to learn English. But if I were you, I wouldn't exchange English with them, since it is not my mother tongue, even if I can speak it as a foreign language.
Why don't you exchange Italian?! Many of them are also keen to study Italian.
Even if your English is so excellent, you are not a native speaker after all.
IMO, it is not fair to be taught be a native Japanese speaker their mother tongue, while teaching them English which you speak as a second language.
Anyway, my recommendation would be SKYPE!
simply install the software and start skyping people! I am sure you'll find someone if you google:S Just give it a try
