Here's my idea: Starting now, as soon as you read this, think of yourself as a writer. 

You are a writer.  Say it to yourself -- "I'm a writer."

Continue to think of yourself as a writer until school is over at the end of May 2013. Let's just try this for the rest of the school year as an experiment. So from now on, instead of embarking on writing assignments as a student, tear into them as the writer that you are.

Over the next few weeks, let's see how thinking of yourself as a writer changes your work.

P.S. Are you noticing a chill in the evening air? Welcome, autumn!