if you are still single, try to find a english speaking girl/girlfriend. move to a english speaking house/apartment, go to westerner's supermarket, try to enjoy westerner's food, make yourself comfortable with english channels and news, remove all of the chinese stuff on your desktop and computer, remove all of the chinese web site, speak to yourself - english is your first language, you breathe english, eat english, smell english and enjoy english. I do not know any chinese who can develop english as his first language after 20 or something, if you are confident about this, please drop me a line, I am about to do that, seriously.