My avi has evolved exponentially over my 2 years, and recently I took the massive leap of faith of changing from my previous human avi to a demoness, complete with claws, wings and horns. I love the responses it gets sometimes. I still weave in and out of my human avi from time to time.. I kind of consider them both as equal halves of my Second Life.
My point: Who says that you need to have only the one regular 'identity'? To this day I don't have any idea of what possessed me (no pun intended) to become a demon but I don't regret it in the slightest. Just go with what feels right.
Edit: Removed stupidity.