What is a writer? Who is a writer?

Someone said something to me today along the lines of, "Now, I'm not a writer, but I think..." and went on about their point (about Harry Potter, incidentally).  I followed by saying, "Well, I am a writer, but I also think that..." and as I continued talking, I had this meta-conversation in my head about the fact that I just stated that I'm a writer.

When I was younger, a writer was one of two things: 1) someone who made their living by writing (or, conversely, was independently wealthy and could spend their time writing, regardless of the income it did or did not bring in) or 2) someone who was so passionate about writing, that even though it wasn't their primary vocation, they found themselves filling all their free time with writing, practically craving the activity.

I have never been either of those, really.  Certainly not #1 and only occasionally #2.  Something is shifting, though, and I find myself sprouting ideas throughout the day - both for the blog and some personal writing I've been starting to work on.  There's still that feeling of inadequacy, though - that the writing I do (here and otherwise) doesn't actually qualify me as a writer. So what will it take?  I suppose having something published would do it - that would satisfy the "income earned" qualification.  Beyond that, I don't know. I'm feeling like a writer lately, though - and that counts for now.