So basically, I was wondering how come stage fright, stress, anxiety and negative emotions in general, which occur (even days) before doing something you deem important, like your acting performance in front of hundreds of people or even something on a smaller scale, like asking someone you very much like out, in, I'd say, a great majority of cases, do not manifest negative outcomes? So your performance ends up great and the person you asked out accepts joyfully, even though you were petrified and full of fears of it ending badly.

If you ask public performers of all kinds, almost every one of them will tell you they have stage fright and stress before a big show. Yet, it all ends very well. How come? I'm sure everyone experienced this too.

Negative emotions are alarms that something isn't right, aren't they? One should engage in an activity only when feeling good in order to achieve wanted results. How can we explain stage fright then?

We can see in this question for an example how fear can be and is a great manifesting force, and yet, it seems it isn't, because things we fear might happen don't happen.

Your thoughts?