Point taken PP, but I don't think that who or what we are is set in stone. Our personalities in my opinion are created by ourselves. At points in our lives we decide that we will react to certain situations in certain ways, and in doing so we create our "selves." I believe that you are who you decided to be, I also believe that because that's true, you could change it if you had the right impetus. I don't know if you've ever read "The Diceman" by Luke Reinhart, but he puts it a lot better than I.
If you are something, it's because you have decided it.