You have different sets of clothes and each change of clothes gives you a different look. Yet no matter what clothes you put on, you are still you.
Perhaps it will help to think of your Christ Self in a similar way—it doesn't change, either no matter how many different ways you look or act on the outside. The real you—that Christ Self—is always perfect and makes you the one-of-a-kind individual you are.
The Christ is the presence of God in each of us. (Does this definition of the Christ have a familiar ring to it? Ten points if you guessed that your Spirit and the Christ are the same thing.)