Now, I am a university student in Australia.
Although, I had studied English before I enrolled in university, I am still struggling because of my poor English, especially writing.
Also, my speaking is not good. I think the reason that I can't improve my English is because I am not so aggressive, kind of shy... so it's difficult for me to talk to people.
I am trying to be more open, and want to be so, but I think it takes a long time.
So, my big issues are English and shyness.
Anyway, because I really hope to improve my English, I am making an effort to do my best.
So please correct my sentences.
Thanks in advance.

Alternatives:
Also, my speaking is not so good.
Also, my speaking is not very good.
Also, my ability to speak English is not very good.

The use of the word "that" in the following sentence is not really necessary.
"I think the reason that I can't improve my English is that because"
I think the reason I can't improve my English is because

Well done.

Please help me studying English, especially writing.

Now, I am a student at a university in Australia.
Although, I had studied English before I enrolled uni, I am still struggling because my poor English, especially writing.
Also, my speaking is not good. I cant improve my English because I am not so aggressive kind of shy... so it's difficult to talk to someone for me.
I am trying to be open mind and want to be so but I think it will take a long time, so my big issues are English and shyness. 

Anyway,because I really hope to improve my English, I will do do my best.
So please correct my sentences.
Thanks in advance.

typical Japanese, ic

Please help me study English, especially writing

Now, I am a university student in Australia.
Although, I had studied English before I enrolled in Uni (as spoken/written in OZ), I am still struggling because of my poor English, especially in writing.
Also, my speaking spoken English is not good. I think the reason that I can't improve my English is that because I am not so aggressive/outgoing, kind of shy (and retirng)... so it's difficult for me to talk to anyone someone for me.
I am trying to be open minded and really want to be, so but I think it takes a long time (it does!).
So my big issues are English and shyness.
Anyway, because I really hope I to improve my English, I am making an effort and doing my best.
So please correct my sentences.
Thanks in advance.

Please help me study English, especially writing

At present, I am a university student in Australia.
Although, I had studied English before I enrolled in uni, I am still struggling because of my poor English, especially writing.
Also, my speaking is not good. I think the reason that I can't improve my English is that I am not an extrovert, I am kind of shy... So I find it difficult to talk to others.
I am trying to be open minded and want to be, but I think it will take a long time.
So my big issues are English and shyness.
Anyway, because I really hope to improve my English, I will make an effort and do my best.
So please correct my sentences.
Thanks in advance.