The pronunciation is not related to the writing of Chinese words (characters). Pinyin is the special system, created for people to learn Mandarin pronunciation. Pinyin transcribes the Chinese characters so people can pronounce it.
The "j" "q" and "x" sounds
You've reached the end of the road! We've saved something special for you, though. The Chinese sounds represented by "x-", "q-", and "j-" in pinyin do not exist in English, and require you to train your mouth to make totally new sounds. Hopefully that sounds like fun! It's not as hard as you might imagine.