I don't identify myself as a liberal because the word makes very little sense to me. It has been used in such a wide variety of contexts that its meaning has been diluted to the point where the term means everything and nothing. I also consider references to "left" and "right" in a discussion of political convictions to make very little sense. You go far enough to the left, you will arrive at the far right and vice versa.
This is why I'm neither a liberal nor a leftist. I define my political views as progressive. I prefer this term because it is the most obvious antonym to the opposing political position, which is conservative. As a progressive, I believe that change, transformation and innovation are inherent to human beings. Even as I'm writing this post, I am not the same person that I was when I started writing it. This is why I believe the conservative position to be untenable. You cannot "conserve" anything because everything changes. It just does. We cannot stop the flow of time just like we cannot hope to preserve any state of affairs indefinitely. Everything moves forward, and a political movement that disregards the nature of things to the extent that it believes in moving backwards or standing still is illogical and unreasonable.