“You must live in the present, launch yourself on every wave, find your eternity in each moment. Fools stand on their island of opportunities and look toward another land. There is no other land; there is no other life but this.” ― Henry David Thoreau
You are energy, pure energy that creates everything you are able to see and don't. Don't limit your belief into something that is a product of what you truly are. You are more than you can imagine, you are the creator and the creation, you are energy.
This reminds me of a TED talk on synthetic happiness. To sum it up, by telling yourself that you are happy through synthetic happiness, you actually become a happier and more satisfied person. Our minds work in interesting ways doesn't it?