[GoNative]

Sounds like you desperately need some other interests and definitely need to take a break from anything Japan related for awhile. It seems you are very possesive of anything Japan related, almost like intellectual property. You believe no one can know as much as you or have the insights you have and you take great offence at those who also have any interest in the country. At least you recognise you have a problem which is a good first step. Like any addiction (which this sort of is) you need to wean yourself off it or even go cold turkey. And you need to fill the void with something else which is why I suggest getting some other interests. Basically you need to stop doing what you are currently doing. Accept that other people will have an interest in Japan but attempt to realise it doesn't matter. Japan will still be Japan regardless of what a few foreigners think about it!
As suggested you may need some professional assistance to do this.