I won't define myself in terms of my marriage status, because I never have. Society is designed that way. We are often judged by that status, and treated accordingly. When I married, it was important to me to keep my name, so I just added his last name to the end of mine. Now I have four names. The way I see it, I had that name my whole life -- why should I change it?
Just so happens that his last name is nicer than my own last name, and much less common, so I decided to keep it for publishing, when the time comes!