Today you will stop procrastinating
Your desire to write is crippling. You sit down at the computer and after the first page you stop and question yourself. "Why am I wasting my time," the voice inside your head squeaks.
Don't listen, just write, and write, and write. Exorcise the words from inside and let them come alive on the screen. Stop looking for perfection, it does not exist. Spit those words out and once they are out of you treat them kindly.
Some of those words need to go away, some need to be replaced with other words, some will help tell your story, some will not. What you need to do is stop procrastinating and tell yourself that you are, in fact, a writer.
Now go write and stop until you finish that first draft! Then go drink a half bottle of something and begin the second draft.