Couple of things spring to mind:
You clearly distinguish a separation between yourself and who you could be (the "limited" you vs. the "expanded" you). When you resolve the issues that create that separation, you'll be more powerful.
The definition of power denotes the "ability to act." Believing in your own power isn't going to create more power in your life, it's only giving you the fuel and inspiration through which to exercise your power. Thus, you will be become more powerful as you become more willing to act.