I would go to China because it is amazing and the country I want to go to more than any other. It would also help my Chinese to get better and I could meet some of my cool friends from China :)

Your question is grammatically correct but in English it would be more normal to say it this way around:
Which country would you go to if you had to live abroad?

I also changed 'must' to 'had to' because 'must' doesn't sound quite right in this sentence, although it is gramatically correct... Hope I helped!