haha lol. Only if you were actually Japanese could you think you could become japanese. You either are or you aren't its a state to be in.

Even decendants from Koreans, lineage of perhaps 12 generations, even mixed with Japanese multiple times... they'll be considered not Japanese. If you don't look Japanese, you ain't Japanese.

At any rate, trying to become Japanese is an individualistic thing, whereas japanese culture is all about subjugating the ego to the community or whatever.

Well, that's all very stereotypical, and there are probably tons of Japanese who don't give a shit about what you are. However, if you try to prove to them that you are 'Japanese,' you'll alienate that group too. Give it up. Culture isn't something in which you can be immatriculated.