You're very close! I'll make some edits.

1  My life over here is terrible.
2  Work environment is not very good (yes you're correct), benefits are few
3  But don't need to worry, every day has only about 10 people getting heavily injured,
4  and I am very careful.
5  We opened a small store, business is not bad.
6  Although I am not very familiar with English, I can still sometimes 
7  (This line is adding a word to the previous line)
8  understand what the white people (we meant westerners) are saying. (Line 6 to 8 are parts of the same sentence)
9  Hope I can get some fame here! I will work hard here, and
10 will be careful with my health
11 Are you (plural) still good?
12 Very miss you (plural), wish we can meet again

(I am a Hongkonger, speaking Cantonese since the day I was born. The other translations using translation software aren't accurate because there is an added character at line 7.)

I'm impressed you remember it! Unless you're in 3rd grade now, in which case it's not as impressive.

Here's Google's translation. Knowing zero Chinese myself, you did very well.

I live very poorly here.
The working environment is unbearable and the benefits are lacking.
But don't worry, only about + people are seriously injured every day,
And I am also very careful. We opened a small shop, and the business is doing well.
Although I don't know English very well, I can understand a little
Understand what those white people are saying.
I hope I can get ahead! I will work hard here, and
Be careful, physically.
How are you?
Miss you very much, hope we can meet again.