If this is something you're good at and feel it in your heart and practice regularly, then you are definantly a writer. As far as getting paid for it, like any craft, it takes years to fully develop your skill of writing to where people (agents and editors in particular) will be willing to pay top dollar for your material. Remember you're competing with thousands and thousands of writers out there, so it definantly depends on the quality (content and error wise) of your material. If you're a sloppy writer who don't like to do accurate research and proof read to look for errors, then no one will take you seriously and may not even finish reading your material.
Make sure that your story makes since and is not overly repetitious, or too vague. It can get a little tiring going back consistently to edit and look for errors, but if you're the self-conscious writer who cares about his product and what his audience reads then you'll gladly oblige.