You must come to terms with the reality that nothing outside ourselves, be it people or things is actually responsible for our happiness.
I think the nerves aspect is a bit of a joke. How hard can it be to walk up and down in a straight line? You just need to put one step in front of another, most people do it all the time. What's the worst that can happen? You fall over. Sometimes that happens to non-models too, it wouldn't be the end of the world.