OP, you remind me of a gaffer that also worked as a teacher in Japan or China and then tried to start something with one of his students. Let´s just say, GAF hated him. And that´s the problem, really: You´re in a position of power here. Forget about the age for a moment: You´re her teacher. Not only is that legally forbidden, it also makes for a weird situation, doesn´t it?
And honestly, 14 is simply too young. Not only would I assume that it is illegal for a 22 year old to be in a relationship with a girl that young, but also is it too many years away from her being a legal adult, which means you´d have to really test your luck if you think that *she´s the one*.
Honestly, I´m not in a much better position than yourself, having feelings for a 16 year old at 25 myself. It´s legal and I´m not her teacher, but you still cannot openly talk about it because of how close minded society is.
My advice: Since you *know* that you´re leaving the country soon, don´t do anything. Because 1.) you say you love her, but what then after you fucked her? Saying goodbye and that´s it? That´d be just cheap and corrupt your love. And 2.), with so little time left, you spare yourself a lot of potential troubles. Fly home and have a nice memory of her if you think she´s worth remembering. That´s all you should do. Best luck.
You´re a sicko. Now how does that feel? Damn, wtf.