I guess I'd have to say "purpose."
I began this whole journey very young, because I felt "right" in feminine garb. My purpose is trying to look like I feel inside.

Sure, there was a certain "thrill" to it in the beginning, but it was more like the thrill a teenager gets from passing their driving test - FREEDOM!
And like the drivers' license, it's become more of a "regular" thing, but I still like it and can't imagine my life without it.