I'm not certain which I would feel worse about: making a mistake that kills me (as in, dead), or making a mistake that causes someone else economic ruin (unable to send children to a good education, for example).
It is that latter situation that keeps me awake at nights being an entrepreneur: that other people are relying on me... that in some way, I am responsible for them and their families... I often ask "am I worthy of this?".
As a veteran, I think I can safely speak for a majority of my compatriots when I suggest that most soldiers/airmen/sailors aren't afraid of making mistakes that get them killed, they are afraid of making mistakes that get others killed.
It's similar to your current fears, but still on a larger scale.
It is that latter situation that keeps me awake at nights being an entrepreneur: that other people are relying on me... that in some way, I am responsible for them and their families... I often ask "am I worthy of this?".