I am so sorry, my friends.

I am so sorry that I used "i" instead of "I" before. Now that I know that is a great big faux pas though I thought it is just easier to type before. It I will not let it won't happen again.  I thought that it would be easier to type. I promise that you will not see anymore of this indiscretion. I hope you can forgive me if I made you feel uncomfortable. I am on the way to study studying English, so maybe and I will make many mistakes for several times, in the future but please believe that I have never want meant to offend you or be impolite. I really appreciate that if you give me an alert to my mistake,sincerely. you will sincerely point out the mistakes.
I will try my best to improve my English so that we can chat with ease  comfrotably comfortably. Wish you have a nice day, my dear friends.1

Don't worry, I shall point not only your errors but also how to write more naturally.  如若你不喜歡我的教導方式, 就可以告訴我. 我知道我是太坦白

1.  In English, it is not natural to write such remarks.  It is OK in Chinese but sounds very strange to English speakers unless this is a conversation.

I am so sorry, my friends.

I am so sorry that I used "i" instead of "I" before. Now I know that is a great faux  mistake pas though I thought it  is  was  just easier to type before. It won't happen again, I promise. I hope you can forgive me if I made you feel uncomfortable. I am on the way to study English, so maybe I will make the same many mistakes for several times, but please believe that I have never wanted to offend you or be impolite. I really appreciate that if you give me an alert to my mistakes,sincerely. 
I will try my best to improve my English so that we can chat comfrotably. Wish you have a nice day, my dear friends.