I go by Alana I have always really liked that name for some reason. Eventually I created a character with the name Alana for an online RPG and I started using it for most of my names in various video games and eventually it has sort of gotten worked into my girl persona. It has a gotten to the point that from enough people referring to me as Alana in IRC's or teamspeak that I now have to try not to respond to it when I hear someone talking about someone else while I am out and about.
When I am in girly mode I don't really do anything much different from when I am not except my internal dialogue reflects that I am in girl mode (if that makes any sense).
Aurora is more of a self given name. It just feels natural
Michelle is the name my sisters used to call me when they had me wear dresses when I was really young. I was their "doll of a brother." Oh the impact it had. They started calling me Michelle again when I grew my hair out. Of course though, my parents and my grandma (in their overly traditional ways) were disapproving of my hair style.