You speak Chinese more fluent than Spanish?! I'm seriously having a hard time imagining such a situation here for a foreign speaker. Since we both have a passion for learning languages, I'll have several questions. Of course.

In school, we learnt language families. And about Chinese, we also learnt that Chinese... how to put that in English... doesn't change the word. No prefix or suffix at all. It's all based on intonation and the place of the word in the sentence. Is that correct? Doesn't Chinese have even one single prefix/suffixed word at all? Then, isn't it VERY hard for even a native to speak properly?
We've also learnt that Chinese (Language family by grammar) is the hardest language to learn, followed by Turkish (language family). Do you agree? Why yes? Why no?

And I agree up there.^^ I, too, have thought you were studying astronomy. Definitely some credits go to your amazing teaching.