No way. I'm already living as me, I don't want to have to be me in my story, too. XD That said, I did definitely give pieces of myself to all my characters.
Honestly, though, about half of all my main characters are based on my sister. And my sister and I are super close, possibly to the point of psychic link, so in that way they are based on at least something that is a very very big part of me.