Sometimes I'm curious, why does it have to be a Japanese girl? You aiming for particular someone? Or you think you have higher chance with girls from particular race?
And Japanese girls talk to every polite person, not just English speaking one. I'm Korean living in Japan, speaking English on daily basis since most of my clients are speaking English, even the Japanese ones, and I'm dating a Japanese girl. But then again, I'm a girl, so I don't know, maybe she likes me because I look like her, literally.
And here's a tip: we Asians (Japanese, Koreans, Chinese) are infamous for being xenophobic, so don't be surprised if those girls reject you. Just a fair warning.
Being single, or being single and spending time daydreaming and craving for a girl from a particular race in one's bedroom? You sound like the latter, honestly.
Don't worry about it. It's 2015. Being single doesn't suck. We girls, especially Japanese and Koreans, love being single and many of us won't get married and not interested in marriage. So you're not alone in that.