Unless you apply for an exchange program or something similar, and then you successfully win the selection process to get a spot for studying in Japan, your dream cannot be realistic under your situation. Of course, having youthful dreams is wonderful,but you seem to be underestimating the legal and technical difficulties involved.
[Legal aspect] As mentioned in previous similar threads, you are still a minor/underage, so living without legal guardians is illegal. (not only in Japan but in any other country as well) Generally, if you want to come to Japan to study, the guardians must be Japanese citizens or legal residents in Japan under certain visas, and they have to handle all the required procedures on your behalf, taking complete responsibility for you during your stay. Based on your story, it seems that you can't expect any assistance from the adults around you. You said you can't rely on your parents, and your aunt did tell you clearly that she won't support you, didn't she? (her response toward you sounds "Absolutely no" to me). This means you won't have any adults who can act as your guardians. In short (and sadly), if no adult helps you, your dream remains just a dream.
[Technical aspect] I'm sorry if this sounds harsh, but your first post sounds like claiming, "Since I know how to write all 26 small letters of the alphabet, I must be eligible to attend an American college immediately!" To be blunt, your current skill level (having studied hiragana but not katakana and kanji) is equivalent to that of kindergarten children or first-graders in Japan. Although you have one more year ahead, I can't help but doubt if it's sufficient to make you reach the required level for attending classes in a Japanese high school regularly. This is especially difficult to do while you're also attending your current school. And as far as I know, there are no high schools in Japan which have classes to teach extremely elementary contents such as katakana and basic kanji.
This is why I suggested looking into exchange programs at the beginning, in spite of its difficulty to access. Such programs send students abroad for short periods (for a few months, at most for one year) and typically do not require very perfectly high language proficiency to participants. Because their main goal is to let students experience school life in foreign country for a while, not providing long-term studies like finishing school there. If possible, let's check with your teachers to see if any programs are available and still accepting applications. However, if there are no programs available for you, or you are not interested in such a program (we, the forum users, have seen some minor kids who rejected the idea of considering an exchange program, because their infeasible goal was to "finish" a Japanese high school), it may be time to consider giving up on this dream once and exploring other options.
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