Fearlessness is not the same as the absence of fear
The fearless person is well aware of the fear she faces. The fear, though, becomes a compass, not a barrier. It becomes a way to know what to do next, not an evil demon to be extinguished.
When we deny our fear, we make it stronger.
When we reassure the voice in our head by rationally reminding it of everything that will go right, we actually reinforce it.
Pushing back on fear doesn't make us brave and it doesn't make us fearless. Acknowledging fear and moving on is a very different approach, one that permits it to exist without strengthening it.
Life without fear doesn't last very long--you'll be run over by a bus (or a boss) before you know it. The fearless person, on the other hand, sees the world as it is (fear included) and then makes smart (and brave) decisions.