My friendly To my foreign friends,

I have had  made about fifteen foreign ["from all over the world" implies "foreign" so using both is redundant] kind friends from all over the world since I signed up for Italki two months ago. But to tell you the truth  frankly ["to tell you the truth" is too wordy and over-used, it's OK for spoken English, not so good for written English], I have used it for less than one month. I feel so lucky, because I have made several good friends through this website and they’re so kindhearted to help me with my English.
For Because  [Try not to use "For" when you mean "Because"] we’re in the different time zones, and all of us have our own businesses or study studies we can only meet on late night in China. But it doesn’t matter, we all miss each other and we often send our respects to others each other when we have time in each spare time. Oh I forgot to say that we keep in touch with each other by ‘Skype’. It’s a kind of software that supports messaging and voice communication are supported just like QQ in China.
We talk about weather, food and something about ourselves such as work and hobbies and so many interesting things. They are so lovely and warmhearted in my eyes because they usually use “miss you” or ”dear Sarah” in our talk. These are expressions that but I didn’t often use before. Different cultures make different people. Influenced by traditional culture, Chinese people are so usually very shy and not so good at expressing our true feelings especially our love and appreciate appreciation in many occasions. But in western  Western countries, people are more open and they dare to say and express their true feelings. That’s really a nice character characteristic that I like most about Westerners.
I want to say”Thanks a lot”and” I love what you did with practising English” to my foreign friends and to my English teacher-Lily. I love you all so much. Happy Mid-autumn Day.

American English Corrections

My Friendly Foreign Friends or even "About My Friendly Foreign Friends". If you are addressing this to them though, then "To My Friendly Foreign Friends".

I have made about fifteen kind foreign The word "foreign" is a little redundant here because you mention they are from all over the word, hence they are foreign. friends from all over the world since I signed up for Italki two months ago. But to tell you the truth or "But honestly", I have used Italki for less than one month. I feel so lucky though, because I have made several good friends through this website and they’re so kindhearted to help me with my English.

Because we’re in the different time zone, and all of us have our own businesses or studies or "and all of us have jobs or are studying at a colleges, etc.", we can only meet on Skype late at night in China. But it doesn’t matter, we all miss each other and we often send our respects to each other whenever we have sparetime. Oh I forgot to say that we keep in touch with each other through Skype primarily. It’s software for messaging and voice communications just like QQ which is used more often in China.

We talk about the weather, food and things about ourselves such as work and hobbies and so many interesting things. They or "These people" are so lovely and warmhearted in my eyes because they usually use "miss you" or "dear Sarah" whenever we talk, which are all expressions that I didn’t often use before. Different cultures make different people. Influenced by traditional culture, Chinese people are usually so shy and not so good at expressing their true feelings, especially their love and appreciation (for each other) in many occasions. But in Western countries, people are more open and they dare to say and express their true feelings. That’s really a nice characteristic that I like most about Westerners or about "Western culture".

I want to say ”Thanks a lot” and ”I love what you have done for me to help me practice my English” to my foreign friends and my English teacher, Lily. I love you all so much. Happy Mid-autumn Day.