So I'm not scared of the dentist?That reminds me of what actors say. "I'm extremely anxious before I go on but when the time comes it all goes away and I'm immersed in the part."
I think the reason is because it's not fear, but anxiety. Anxiety is about the unknown and the future. Once you are in the fearsome situation, it's too late. All decisions are out of your hands. You have no fear of running away because you are committed. Once it's over it's too late.
What does fear feel like?