Normally the people who come around here with their 'running away to Japan' ideas usually get shot down awfully quickly. But unlike most of those people, you at least seem well-spoken enough to deserve a decent reply, which MMM has given you.
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Will having only a high school eduction make it extremely difficult? (Ex; getting an apartment/job) I know it will be hard, but not impossible.
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No, it really is pretty much impossible. As MMM said, you need a student or a working visa. A tourist visa only lasts 90 days, and Japan is cracking down on people doing repeated visa runs to Korea.
Everything you find hard about living in America will be twice as hard in Japan with no money, no job, no place to live, and no significant Japanese language skills.
There's really only one way for you to stay in Japan long-term without having a bachelor's degree, and that's by enrolling at a Japanese language school, after which you will receive a pre-college student visa. Even after you do this, you are highly limited as far as finding jobs - you'll only get to work a small number of hours every week. The language school will cost plenty of money, and if you manage to find any accommodation, that'll cost a lot of money too - more money than you could ever bring in working a job with a student visa.
Long story short: go to university in the US, do a study abroad in Japan, then when you're done you can find a job in Japan and move there.
Edit: posted this before I saw Nyororin's post, so some of this might be redundant :P