"I want to be loved by somebody who doesn't have to love me" - I may sound like a prick, but really, if your parents were awful enough, they'd make you go to work now. Because I have a friend in your country who was forced to drop out from school at the age of 16 to support his father, after the mother ran off with another man.
Parental love shouldn't be taken for granted.
But like
>>2 said, if you can't hold it anymore, and if you're capable of taking care of yourself, go for that student exchange programme. Japan can wait when you're successful and can travel.