yes you are addicted, and if you wanna become better at this game, u should force yourself to not play with them for a period of time...
I played with the chinese a whole lot, and won with a lot of bad strategies, mainly because I knew I could out expand and out tech everyone. they really don't have any obvious weaknesses... but you will not learn much new if u keep playing with them.
after playing so much with them, i found myself in the same boat and couldn't find good strategies for starting with 2 pop in a city, and having to tech a little slower. it was brutal. I liken the Chinese to the Zulu now. They're easy to use, but really make u a worse player because you're relying on those huge bonuses.
I created a new account and started playing random more, and realize there was so much to the game that I reallly wasn't taking advantage of with the chinese,,, Now I'm just as strong with the Spanish, Arabs and Greeks. with pretty much any civ I can hang with a Chinese player that thinks there good because they tech faster than most of the ppl they meet online and they just think they'll coast to victory everytime.
most chinese players aren't agrressive after the horserush until they get knights or tanks, but when u see 5 legion or catapult armies knocking on your cities doors, you may realize your screwed. Or when u finally get to navigation, and you realize the spanish have already settled all the good islands, you'll staginate.
pay attention to those games where u lose with the chinese and take account of their weaknesses, and admit they have some, they don't have that many, but there's probably some holes in your game that they are just covering up for u, which is really evidenced by your not being able to play with other civs effectively...
u may be asking, if they're really strong, why should I use anyone else?? Well, how do u feel about the Zulu-only players? I don't think I've ever lost with the Zulus, but I don't enjoy playing with them either. I've maybe lost 5 games in total on MP with the Chinese, but it gets old, and they aren't always the best choice.
play with someone else, you'll learn so much more, and then apply what you've learned to the chinese, then you'll be really unstoppable.