I often ask myself this question, Shang Wei, since I often teach students from Asia and try to understand the cultural differences between us. I think Western people tend to have more boundaries with regard to some topics and personal information when they first meet someone. It's better to talk about very "light" topics at first, as Valerie said, TV shows, books and movies are a good start. Additionally, if you watch movies or TV shows in English you might also learn good words and phrases to help you communicate and maybe learn something about culture too!