Good Job!  Your English doesn't suck, it just needs some minor tweaking. =)
I have some of the same problems with Korean.  Your English is much much better than my Korean, though.  I accidently told my friend I was going to eat my family for supper. O.o
correction
opinion

 

Revised:

I found this site accidently. To be honest, writing in English makes me nervous! However, I have to do this, 'cause one month later there is an exam, IELTS, waiting for me! Well , as I have no choice at all, I  have decided to write some short articles in here, if I have time.  Everyone can laugh at me! Yes! My English sucks!! I hope my article can be revised by an English native speaker.Thanks！If anyone wants to practice his/her Chinese, I can help.
Here is my introduction: I have worked for about one year. This summer, I resigned 'cause I want to study in Canada. That's the reason why I'm learning English.
I can remember the meaning of a word, but I cannot use it appropriately. Words are not the biggest problem. The biggest problem is, what I write and speak seems so unnatural! Typical Chinglish! What should I do?? Another thing I think is difficult about English is the tense. I'm not sensitive enough to it.
I hope for someone's help. Thanks for the revise.

First notebook entry: Introducing myself

I found this site occasionally. To be honest, writing in English makes me nervous! However ,I have to do this , cause one month later there is an exam, IELTS, waiting for me! Well , as I have no choice at all, I  decide to write some short articles in here if I have time. Everyone can laugh at me ! Yes! My English sucks!! I hope my article could be revised by an English native speaker.Thanks！If anyone wants to practice his/her Chinese,I can help.
Here my introduction: I had worked for about one year. This summer I　resigned cause I want to study in Canada. That's the reason why I'm learning English.
I can remember the meaning of word,but I cannot use it appropriately . Words is not the biggest problem,the biggest problem is, what I write and speak seems so unnatural! Typical Chinglish! What should I do?? Another thing I thought difficult about English is the tense. I'm not sensitive enough about it.
Hope for someone's help.Thanks for revise.

I've heard the word divan before, but I believe sofa or couch is used more in common conversation. When I hear divan, I think of a specialty boutique or fancy inn.

Great job!
Hobby is pluralized because you are listing more than one hobby.  Sports and cartoons because they are generalized groups rather than a specific sport or cartoon.

First notebook entry: Introducing myself

You can call me Alex.
I'm still a student in South China Agricultural University.
My hobby are photography, sport, and cartoon.
My hobbies are photography, sports, and cartoons.