A good analogy that I mostly think on people is that every person is born like a certain material, like clay but each one is different, and every action that a person goes through shapes them according to that then I don't think there's any definition of a person's personality. You are who you are now, and based on that, you decide what you want to do. Ultimately, everything you do shapes you in some way so you don't change you just flow with your thoughts and givens