I have the same problem as you in writing, but I have some teachers who always advise me. Reading is the most important skills which helps you to enhance your writing. Through reading you will have items of vocabulary, and you will learn how others write. While you are reading such as a novel, try to concentrate in different aspects such the structure and the way that the write used, not just focusing on the meaning, and always ask your self about why he used such kind of sentences and expressions.
I wish that my advice will help you because it helps me a lot.
Rami
Palestine
rame2000sat@yahoo.com