Art is a form of expression, escape. Writing is a form of expression, escape. It is these two forms that encompass the same. To be a writer, and good at it you must possess that of an artist.
This.
However, to answer what the OP most likely meant, I consider myself a writer (I've actually got some projects in the works), but I suck at drawing.
However, I aim to learn, especially as my main project will at the very least require me to do storyboards.