I feel the same thing. There's a nagging self inside that force my fingers to type, if not write on paper. I guess for me it's just need, not want. I don't want to write because I actually can't write but I have to because something in me loves it so much. But I hate it. Yeah I'm with you. Relationship with writing is confusing.
I write because for that one moment in time I'm God. I control what happens to people in my stories and for a simple second, I'm in my own perfect little world where nothing can be bother me. I don't think I'll stop either. Even if I don't write full stories, I still have the urge to write.
I write because I get emotional, and writing is the only way to give it a reason. So I suppose it is a psychological thing. But it's also a "F--k it, I'm bored" kind of thing. It takes me five minutes to write most of the things I do. There really isn't a reason for it. It doesn't bother me, either. I mean, I do have the feeling I should be writing an actual novel, but then, I don't care at all. And I've never thought of myself as a writer, or a potential writer. So.