I don't believe we have the 'unit' of who we are correct. Stopping at identity is lazy. There are conflicting voices beneath that. Some of the divisions of who I consider 'me' are linked to circumstance. If certain things happen, the emotional cocktail that leads to my regular response may be one I like identifying with, and it may not. As I get older, there are aspects of me I want to change, but that get harder. I have worked hard at 'training my elephant', so I am relatively good at creating habits. Some habits are deep soaked. We don't change by changing our beliefs. Our beliefs soak deep, and become ingrained responses. Change isn't a decision. Change is a process.