Hi Manuel I will tell you that if you have never been to china and you absolutely need a job at this point then only go for it if you can't find alternatives. I would say try Taiwan or South Korea first because although those places aren't the best to work at either they are certainly better than china. At least in Korea you get a cleaner environment and better internet. In Taiwan people respect your personal boundaries more.

You deserve a clean environment with good breathable air. You also need food that isn't cooked in leftover cooking oil that was collected from the sewers. Find a place where more qualified teachers go.

Lastly, no matter where you go avoid hanging out with folks that see the world as made up of nothing but the country that they're working in. Don't change your values no matter what. You already grew up in a superior educational system and have better moral values. Think critically about what people say to you when you are overseas and don't let other jealous folks bring you down.

Good luck, if you need to ask me anything you are always free to email me.