Yeah. I can't see why not. If anyone can edit and change any page on Wikipedia, I don't see why you can't edit your own. But beware, if you change a lot of other people's work, (or maybe your own) someone might make it so no one can edit the page and then you're in trouble! I think it would best for you to make your own page, because no one knows you better than you, such as your childhood, and things like that.