Can people change?

I know for a fact that people can change. I, myself, have changed from that which I was into who I am now. I used to be very introverted, and didn't want to talk to anyone. I was very bookish, reading all the time, and playing video games when I wasn't reading. I was desperate for the approval of my peers, but I didn't have any. I had no idea how to talk to girls, and even though I had the occasional run-in with a girl who didn't know better, it wasn't long until I was single again. I'd been kissed by exactly one girl by the time I finally got a clue and got laid (after high school). And then one day I picked up a book that explained social dynamics and the way I could act and talk in order to not only get others to like me, but to actually get the female persuasion to give me the time of day. I found out that there is a science to everything, and being the huge nerd that I am, was able to research and apply these methods to my life. And it was changed forever. From the first Her, to my subsequent success with women and friends, and I'm currently building up my financial profile as well, not to mention the wonders it's done for my writing.