I have changed so much

Who am I? I don't know. I have changed so much, and now I can realize who I really am. I change every day, every little second. I think everybody is like this.
I look at the mirror and I can not recognize my face. Is it normal? I have changed so much.
The way I talk, the way I think, the way I write. All have changed so much. But I know, I still being who I was, but with little (little?) differences. This is the life, always changing.