A Misunderstanding!----The English Exclamation Mark

Several years ago, I had a misunderstanding with my close friend, which made me (have been) unhappy for a long time.
When I sent my foreign friend a message in English, (an English message, then) I added a Chinese sentence at (in) the end with an exclamation mark. (exlamation.) 
Then, I was asked why I had yelled at (to) her. I was really surprised as (.) I had meant to joke with her with that last sentence, but she couldn't understand Chinese very well, and told me using an exclamation (exlamation) mark meant (means) yelling in US.
If we want to show our (your) strong feelings, happiness, sadness, love, passion, excitement, hate, we use ! at the end of a sentence. In the Chinese language, we don't have similar parts of speech.  (marks can show shouting or yelling to listeners.) Our Chinese people are so kind and polite and (,) few people will use (say) slang or be impolite to others. (, don't mention yelling to others.) Maybe a small group of people will (do), but most people will look down upon them.
I was so sad for a couple of days. My close (closed) friend couldn't understand me and our Chinese people.
Even though I 've learned English for a long time and was told I had (my English) made great progress, (but) I still couldn't make myself understood.
I made up with her, but (I) still haven't had a chance to explain (explained that) to her.