how do you help someone not be afraid if you dont understand what they are afraid of?

@Bang5luts the thing is I cant understand why I am not afraid because I dont understand why they are afraid

as an example:

I will get in front of any audience and give a fully improvised 30 minute speech at a moments notice without any preparation (ok.. its a bit of an exaggeration, but not much)
many people wont do that, or will perhaps even be reduced to dribbling stammers if they get put on the spot like that.
I just dont get that, but at least I recognize that I dont understand that fear.
but it also means that I dont think I can help... because 'just do it' (which is what I do) wont work for them

@Tracos oh but it will work. You don't understand why you aren't afraid. You just aren't and you are satisfied with that fact, therefor you don't tear apart and examine exactly why you aren't afraid. But you really don't need to. You simply aren't afraid because you know they're isn't any reason to be. And the other person/people's fear is irrational. It's much more simple than that even. You are not afraid, so you don't focus on the people watching you speak. They shouldn't focus on people watching them speak when writing a speech, because when they are writing a speech no one is watching them speak either. They need to simply focus on the task at hand. If they are afraid of speaking in front of others, remind them they do that daily in fact several times throughout the day in their normal daily activities