DX Improve Writing

I'm trying to improve my English writing skill because I'm bad at that. (I wonder if I can say I'm bad at it. It sounds odd.) I'm trying to improve my writing because I'm not so good at it. 
Now 2 of my foreign friends, all I have, had return to their countries so I need to type them to contact them Dx My only two foreign friends have returned to their respective countries so I have to write to them. 
I have a headache already. They are both native English speakers but from different countries. (필요없어요)
I think they affected my accent already. They said that sometimes I sound like an American and sometimes like an Australian.
That's their from. That's where they are from, Australia and America. Just my accent (뜻이 뭐에요?). My grammar and writing is are a mess.
I hope I just sound like a Korean who think I know proper English. I just hope I sound like a Korean who knows proper English
But, I don't much mind it. I don't mind it so much. I just want to become better at writing. a better writer. 
I'm using more words when I'm speaking because I don't know how to spell the words I use. When I speak I use more words than when I write because I don't know how to spell very well.
Haha, I don't have much words I able to spell it right. I don't know how to spell many words correctly. 
Please correct this. I want to know what did I wrong in this simple post.

잘 하시네요! 진짜 자연스려운 썼어요. 제가 도와 드릴게요. ;)

I'm trying to improve my English writing skills because (I'm bad at that it) / my writing is poor.

Now 2 of my foreign friends, all I have, Now my only two foreign friends have had return to their countries so I need to type write to in order to contact them.
I have a headache already. They are both native English speakers but from different countries.
I think they affected my accent already. They said say that sometimes I sound like American and sometimes Australian.
That's their from. Just my accent. My grammar and writing is are a mess.
I hope I just sound like a Korean who thinks I they know proper English.
But, I don't much mind it mind it much. I just want to become better at writing.
I'm using I use more words when I'm speaking because I don't know how to spell all the words I use know.
Haha, I don't have much many words that I able can to spell it right correctly.
Please correct this. I want to know what did I got wrong in this simple post.