Fear of writing

I always loved writing. I think it was the only thing I liked. I remember every time I had a language test, the very first thing I did when the teacher gave me the exam was to look at the title of the essay, article or whatever I had on task to write so I could think of ideas in order to put them on my paper… I used to enjoy writing…
The last years at the Lola Mora have been more or less the same but this year was the exception. I do not know why is that I feel this way but I feel like everything I write is wrong; especially with the essays.
My English Language teacher told me I should be more organized before writing something and I did try but I keep on doing the same mistake. In fact, there are times that while I’m writing something I notice the failures but as I don’t know how to correct them I let the things how they are. I feel like I wouldn’t be able to write something better.
Now that the English Language exam is coming I’m worried because I still have doubts about my skills to write a good essay. All I know is that I hope to overcome this fear before that day because if not, I know I’ll feel quite disappointed of myself.