I dunno. It seems like a fear of failure.

I would say that even in the end, if whatever good thing that happened to you ends up not lasting forever, you've got to be happier for having done it anyway.

Like, you took exercise for example. I used to work out avidly and be in good shape, and then I got depressed and gained a lot of the weight I lost back. But I am happier for having done it even if I can't see my efforts physically now because now I know I can accomplish that goal, having already done it. And when I was doing it, I derived a lot of happiness from it. And that was worth it.

It's like that saying "it's about the journey, not the destination."