I was not afraid of many things until some of them almost killed me. I was not afraid of moose, until I happened across a den, and Mama came sloshing across the marsh, with a conviction of purpose that would send all but the stupidly brave running. I have never before or since been so afraid; I could hear, and almost smell, hawks, from miles away. In those moments, I could hear the mice on the forest floor.
In my youth, I paddled Fairy Point in a gale wind (it's in Missinaibi Provincial Park, look it up), with waves over my head in a 17' prospector canoe - literally. I went back there in recent years and I was much more aware of its lethality. With a motor that could get me the Heck Out Of Dodge, I was afraid. Water over the gunwales in a small boat is nothing to sneeze at.
Is it just age, or is it experience, that tells you it's OK to be afraid?