If you don't ask this question then there is something wrong with you. Everyone should have at least one moment in their life where they put that question to themselves. Who am I? What kind of person am I? Am I a good person? How do I become a better person?
The answer is who do you want to be and how do you become that person. The best quote I ever heard was "You are who you pretend to be" You should always ask yourself Who you are because that is how you become a better person. Self reflectivity is what makes you a better person.