Why Can't I

It seems easy enough to do. You sit down and type. But when I sit, nothing comes to mind. So I read instead. I read other people's writing and sale notices and emails from companies that I don't want to buy anything from. Then I read books and newspapers. All these other people can sit down and put words together that someone else will want to read. So the question is, why can't I? I was watching an author (Steven King, I think) being interviewed on television and he said that amateurs wait for inspiration while the rest of them just get busy and write. So this is me, getting busy, writing.