There is a difference between learning and abiding by the culture of say UK for years, and me visiting China for 8 weeks on a work visa. I am not Chinese. To consider myself Chinese, I will have given up American citizenship, lived there for years, speak the language (I know less than fifty words of Chinese), marry a Chinese woman, and have Chinese children, and even then I will have Chinese people tell me "You are foreigner" until the day I die, sixty years later ( assuming age 20-30). Depending upon how big a country is into racial identity, if you look different from norm, you may never get accepted.