OH, NERVES

I'm not sure why I get so nervous for things that I know are going to turn out just fine. But I do. It's nothing new - but it's a sensation that I've become very familiar with recently... the anticipation of a night out or a dinner with friends or even a conversation at work, and if I'm idle for too long before it happens, my stomach starts to flutter and I find myself having to breath more deeply in those few minutes of free time. Oh, nerves! Wherever do you come from?