Previous Lives

I wonder about previous lives often. Is it possible for someone to have lived once before and come back later as a different person? I blame this theory for the type of person I am, whether it's possible or not. I want to know what kind of person I was/might have been/probably wasn't (doubt I'll ever really know but it's fun to speculate). I hope I was a brave person and that I wasn't infamous for anything. I would like to have been someone who made an important difference, even if making that difference resulted in my death like Joan of Ark (I know I'm no Saint I said like) because hey, I'm perfectly fine now. So what if it might not be true, there's a chance that it is.