Courage is a State
Courage is a state. You don't have to be a person who feels courageous all the time in order to speak and act with courage. You can be in a joyous state for a few minutes, even if you aren't always joyous. You can be in a serene state for a while, even if you aren't always serene. You can be in a centered and balanced state, even if you aren't always this way. The same applies to courage.
We all have the ability to access a state of courage. At times we might find this easy, and at times it could be difficult. The more times you practice accessing courage, the easier it will become -- even in situations where you previously weren't able to do so.