Do you know who you used to be? Do you know how you've changed?

Are we the same person all our lives? Assuming the answer is no, then we used to be someone else and we’ve changed to become who we are now.

I’m thinking about this in terms of a fundamental sense of identity. Who you are when you think about it to yourself. Is there some significant personality change you’ve gone through? Has this change occurred quickly or over the course of years. How has that affected you? Who were you before this change?