As kids we think being an adult means doing whatever we want. Then we become adults and we get stuck in a holding pattern, waiting for someone to tell us it's okay to do the thing we long to do.
Seeing my desire to be creative as something I am meant to do, the inner dialog changed to "I have a responsibility to do this." Not in a heavy way, though but more like "This is my purpose."
While creative resistance may seem to come from outside of you, it is self-generated and self-perpetuated. It is also a force of nature and a liar. It's fuel is fear.