As quoted below in my signature line, “A writer writes.” If you want to be a writer or say you are a writer, you must write. Plain and simple.
My advice to you, anahid, is to just keep writing. Write something everyday. It may not always make sense, it may not always be good, but somewhere in the middle of all that writing you will find a gem.
Also, keep coming back to this forum. The people here are very knowledgable and the tips/ideas they share are very useful.
I wish you well!