First, there ARE a lot of threads on this forum about this topic and I usually just pass them by. If you're serious about moving to Japan then you should have read them all by now.
I've lived in Greece, Belgium, Luxembourg and now Japan (5 years here), and I'm by now a confirmed America-phile so the idea that you HAVE to leave the US because it's so lousy is, yes, off-putting as somebody else has said.
But I get it, you want to move to Japan. So here's the practical advice:
First, do research. Not only in forums where you get everybody's wild responses, but in real official sources as well. How about the government of Japan?
http://www.mofa.go.jp/j_info/visit/visa/03.htmlthat's a start. If you can find this forum, you are internet-savvy enough to do your own research.
Second, have a plan. Look at what's required, and how you are going to get there. Again, don't rely on general advice from people you don't know. What do you want to do with your life, other than 'move to Japan'? You have to support yourself. Get busy figuring out how. Americans do not have as many options for obtaining residency in Japan as some other nations (we don't have the 'working holiday' option) so as far as I know you'll need a degree at least.
Take charge of your plan. Know everything you need to do, inside and out. Know the education requirements. Know the visa requirements. Know how much it will cost to buy a plane ticket. Don't let yourself be at the mercy of anyone else who knows 'a little bit' about what you want to do. Become the expert so you do what you need to do without casting around looking for advice.
And last, I'd recommend you visit Japan for a bit before deciding it's the place for you. There's lots to like here but quite frankly though I know enough japanese to get around I will never feel that I belong...everybody's experience is different but unless you really take a look at this country (and it's not at all like the image I made up in my mind before coming) then I for one can't imagine that you're going to be happy moving here just because it seems like a cool idea.