This is manifestation at its very heart. When you believe something about yourself, and it becomes the "that is just who I am", you behave in ways that manifest the reality of this belief. To change who you think you are, change you scripts. Any statements that remotely resemble, "That's just they way I am", should be expunged from you vocabulary. If that is just who you are, then that is who you are! So who do you think you are? I am god! Regardless of the current outward appearance, the reality of your inner manifestation will quickly be reflected in the outward appearances. When you know you have manifested what you desire, you act like it is already a reality. The outside quickly catches up with the inside reality.