I manage to get rid of the Chinese-English

I lay awake all night,because I say said something rude and confensive offensive in the exchange groupe due to the ignorance of the differences of countries and culture cultural differences.May I hope my words wouldn't didn't hurt the my foreign friends. I am very very sorry. I didn't mean to hurt you, I just don't didn't know it.  I was sad because I don't didn't know.  somehow,how could I say that How can I say such things to others?  Anyway I did manage to insult them.  Am I really rude? In the real life I am not that rude at all. Now, it's neccessary for to learn the differnces between countries. I need to learn more about the subtleties of different cultures. Now, I just don't have the courage to speak in the exchange group now!

If I were you, I won't be sweating (worrying) about it.  Your foreign friends will understand because you are learning English.  Here's a story I can relate to you.  My French brother-in-law although is good but does not understand the subtleties.  The first time he came to my house and saw a pretty vase on the mantel and said to me aloud,

"This is very beautiful.  I desired it."

Imagine the horror on my face!...  Go check your dictionary to see what "desire" in English mean.  In French, "desire means I like".