Sometimes we're not ready to do. Sometimes we need to learn, understand, heal our minds and prepare for action.
Before any athlete competes, they train their bodies. The same goes for motivation -- you can tell yourself all these wonderful things, but only you are the one with the power to act on it.
There are going to be times when you feel like you can't do it. But you can do anything. You just need the right mindset and attitude for it.
Whether or not you're not ready to act, this may be the first step. This may be something you need to go through in order to become stronger and wiser.
Nothing is ever unattainable. Push yourself. The worst that can happen is trial and error.