Writing

How difficult for me to write a blog in English even only 120 word a theme. One of the reasons is that I am not good at grammar. Writing a theme must consider the tense and grammar of the contexts, but I always don’t understand what’s the tense or the speech should I used. Therefore, I usually get the bad grades at the course of writing, and it’s also strike the confidence of mine very much. Another reason is that the vocabularies which I know are much less. When I have a brilliant inspiration of the topic, I don’t know how to express it thru the words to let others know what I want to say. So, I think that I must enhance my grammar and vocabulary's abilities in order to overcome the fear of writing and write down to the smoothly theme which I would like to speak.