This is a translation from your Chinese.  So it is more accurate in your intent.

Disadvantage is a blessing

Recently a bad thing was happened in my life, it made my heart become very bad. I not only afraid to talk to strangers, but also can’t believe anyone. Yesterday a friend from England has been encouraged me. He lived in China, but not in Beijing. He gave me a big help, though we were far away. I will always remember his help. He was a friendly gentleman and he still cheered me. I really thanked him for help me.
Friendly to everyone, but the world is too big to full of wonders. Not everyone is a good and friendly person. Not every story has a perfect ending. Although I met a bad thing, I still believe the world was a beautiful world. Life goes on, as soon as I look at the whole world in a good heart, everything will be fine. China has an old saying that ‘Disadvantage is a blessing’.


最近发生一件不好的事情，

Recently, an unfortunate incident happened.

这件事使我的心情变得很差。

It changed my feelings for the worse.

我不敢和陌生人说话，也不敢相信任何人。

I am now afraid to talk to strangers and also dare not believe in anyone.

昨天一位英国的朋友一直在鼓励我，

Yesterday, a friend from England had been encouraged me continually.

他现在住在中国，但是不是在北京。

He is now living in China but not in Beijing.

虽然我们离得很遥远，但是他给了我很大的帮助。

Although we are far apart, he has been a great help to me.

我一辈子也不会忘记的。

In this life of mine, I shall never forget.

他是一位友好的绅士，一直在为我加油。

He is a friend and a gentleman who has been urging me to carry on.

真的很感谢他。

I am really grateful to him.

我对每一个人都很友好，

To everyone, I need to be friendly.

但是世界之大，无奇不有。

The world is huge, there is nothing that is not wondrous.

并不是每一个人都是好人。

Not everyone is a saint.

也并不是所有的故事都是完美的结局。

Not every story has a happy ending.

虽然我碰到不好的事情，

Although I met with some unhappy circumstance,

但是我依然相信这个世界是完美的。

I still believe that this world is a place of good.

只要我用一颗美好的心去看世界，

All I need is a kindred heart to look at it.

那么一切都会好起来的。

Then everything will become good.

中国有一句古话：

There is an old Chinese saying,

吃亏是福。
"There will be happiness in adversity".  [In English we say, "When given a lemon, make lemonade."]

Disadvantage is a blessing in disguise

Recently, a bad thing was happened in my life, it made my heart become very sad. I am not only afraid to talk to strangers, but also can’t believe anyone. Yesterday, a friend from England has been encourageding to me. He lived in China, but not in Beijing. He gave me a big help helped me greatly, though we were far away. I will always remember him for his help. He was a friendly gentleman and he still cheered me on. I really thanked him for helping me.

Friendly to everyone, but the world is too big, too full of wonders. Not everyone is a good and friendly person. Not every story has a perfect ending. Although I met a bad thing had a bad experience, I still believe the world was is a beautiful world. Life goes on, as soon long as I look at the whole world in with a good heart, everything will be fine. China has an old saying that ‘Disadvantage is a blessing in disguise’.

你做的很好，加油！

Disadvantages are blessings (in disguise... we often say something is a blessing in disguise when initially something seems bad, but when all is said and done, one can learn good lessons from it)

Recently, a bad thing was happened in my life; it made my heart become very sad.

Make sure to use commas before sentence-opening adverb. The verb "to happen" doesn't take the verb "to be" but it can take "to have" (perfective tense, eg: an accident has happened). Avoid comma splices; two independent clauses cannot be joined by a comma. I took become out because it's superfluous. Collocationally, hearts don't usually become bad, but rather, sad.

I'm not only afraid to talk to strangers, but also can’t believe anyone. Yesterday, a friend from England has been encouraged me. He lived in China, but not in Beijing. He helped me a lot, though we were far away. I will always remember his help. He was a friendly gentleman and he still cheered me on. I really thanked him for helping me. 

Don't forget the form of "to be" after a subject pronoun. In formal writing, include the comma after a sentence-introducing adverb. When using a simple time marker like "yesterday" it's best to put the verbs in past tense. "To give someone a big help" makes no sense; it's more natural to say "He helped me alot." The word "still" makes no sense here. The phrasal verb is "to cheer on." After a preposition, a verb must be in its gerund form.

I'm friendly to everyone, but the world is too big, too full of wonders. Not everyone is a good and friendly person. Not every story has a perfect ending. Although I encountered a bad thing, I still believe the world is a beautiful world. Life goes on. As soon as I look at the whole world (from a better perspective - in a good heart makes no sense), everything will be fine. China has an old saying that "Disadvantages are blessings (in disguise". 

Again, don't forget the appropriate form of "to be" after subject pronouns. Don't forget to vs. too. One doesn't meet problems, but rather they encounter them. 遇到 in Chinese is used for both, but in English, we make the distinction. "The world is beautiful" is clearer than "The world is a beautiful world" (saying it this way is superfluous). Again, avoid comma splices. It's best not to overuse the semi-colon ( ; ) - only use it when the sentences are exceptionally connected in some way. In other cases, juse use a period after the first sentence. "With a good heart" makes no sense. I can't think of a better idiom, but "from a better perspective" while being somewhat dry makes sense in this context what you're trying to say. Again, the most natural English idiom is "blessings in disguise." Also note that when you make a generalization about things, it's most natural to put whatever "thing" it is in plural. For example, Apple is good. Not right. Apples are good. Disadvantage is a blessing. Not right. Disadvantages are blessings. (Note the absence of the indefinite article, a/an).

最近发生一件不好的事情，这件事使我的心情变得很差。我不敢和陌生人说话，也不敢相信任何人。昨天一位英国的朋友一直在鼓励我，他现在住在中国，但是不是在北京。虽然我们离得很遥远，但是他给了我很大的帮助。我一辈子也不会忘记的。他是一位友好的绅士，一直在为我加油。真的很感谢他。
我对每一个人都很友好，但是世界之大，无奇不有。并不是每一个人都是好人。也并不是所有的故事都是完美的结局。虽然我碰到不好的事情，但是我依然相信这个世界是完美的。只要我用一颗美好的心去看世界，那么一切都会好起来的。中国有一句古话：吃亏是福。

Well done! I hope my corrections help you. Keep on writing!