Not living up to the expectations set out by me and the people around me on myself.
I am indifferent to death, I am sure I would have some sort of adrenaline filed fight or flight response when faced with it but the idea itself does not scare me.
I don't go into something thinking that I'm going to fail. I suppose if I did worse that I expected I'd feel bad. But I don't think it's a fear I have.