What makes one a Writer

What makes one a writer? Just because you wrote a book or two are you a writer? Maybe or maybe not. It seems I´ve never been one to express myself vocally, but have always been able to express myself in my writing. The thoughts seem to just constantly flow like an open faucet, it´seems it has always been easier for me to write my thoughts out than expressing them in speech. I tended to run on the shy side as a kid, so writing was an easy way to express myself. Kicking out the first novel was a real challenge what seemed an impossible challenge, in the beginning, turned out to be not so bad in the end. So, it seems each book gets easier and easier as I continue down this road of creativity.