You never thought your marriage was disposable? You were the one who was spouting off a little while ago about marriage not being forever, the divorce rates are really high, blah blah blah.
You met a guy online, flew to Japan to meet him, stayed with him for 3 months and then got married. You tell us that you spent the last year trying to make it work, and getting to know him.
Most people have dating relationships that last more than a year before getting engaged. And the average engagement is a year.
Your marriage is a year. Why? I don't know. And why did you get married in the first place? Maybe you wanted to stay in Japan so bad, and the only way you could was to get married. Even though you were only 18 and extremely immature, I just can't see a rational, sane person ever thinking this could have worked out.
Truthfully I have no idea why you did this. It was stupid. You say you have learned your lesson but I don't think you have learned the entire lesson.
Or if you have learned the whole lesson you are to embarressed to admit it on a message board to strangers who were critical of you.
You spent so much time trying to convince us that what you had made sense and was wonderful. Now that it's falling apart around you (though it apparently was falling apart while you were trying to convince us it was great) you are trying to defend all of your actions.
Just admit you were stupid and we can all move on.