sometimes i forget and then have to remind myself "wow...im dating a japanese girl, she comes from a far away place thats different from my own, she speaks a different language and yeah....wow.....japanese.....and im dating her...."
i think if you were to find yourself in such a relationship, and you two fall in love, you soon learn to forget the fact she/he is japanese or another nationality, it just seems to slowly become blended into what makes her, her, so its just part of her and you dont seem to be to concerned about it anymore.
another thing i learned is that while your all crazy for japan and japanese, your unlikely to actually get a japanese partner, that just isnt the way it works, if you want a relationship, you learn to love them for them, not because of where their from, thats how a solid relationship is formed and thats what japanese tend to look for.
i know this because the entire time i was an otaku (shameful past) the most i got from a japanese chick was meeting one once, and getting called an otaku and having her turn her back on me, at the time i thought it was funny, and it still is, i cant explain why its funny, just that a japanese chick called me an otaku *shrugs* anyway my point is, it doesnt get you relationships!
so sorry if im bursting any bubbles, it might be possible, but while you pine for japan with this rose tinted unrealistic idealic fantasy of it, girls/boys will just avoid you for anything more then maybe used as a short term trophy partner, thats even if they think your just normal enough not to act wierd around them.
though, there might be some otaku lovers out there, who knows.