Also just for reference I'm european, I've been studying japanese for just a year and I've been subbing Utabans for 3-4months now. It's not THAT difficult.
Enthusiasm is good but it doesn't cover everything. I thought I could sub animes after I had studied for a year and a half, and I did try my hand at it but almost half of the lines were just educated guesses. When I look back at those attempts now, they look rightly hideous. I have the courage to admit it now. Of course the viewing public isn't the smarter because they wouldn't be watching fansubs if they understood the language, now would they.
I'd say it took me 3-4 years after that to *really* start grasping Japanese at a fundamental level, not just translating in my head. You'll know what I'm talking about when you get there. It is a magnificent feeling though, when the pieces of the puzzle finally fall into place.
Oh, and I'm European too, if that matters. I just don't think being Chinese is that big of an advantage. They use some of the same characters, but that's like saying it's easy to learn Polish if your native tongue is Hungarian because you already know the alphabet.