Back to the 'butterflies' and nerves part of this topic.
Think about the way you feel when you are mildly nervous.
Think about the way you feel when you are vaguely excited.
There isn't a difference, it's only what you choose to call it.
That sounds horribly Southern Californian, for which I apologise, but it's true - the physical sensations are pretty much the same.
So, you decide, are you excited or are you nervous?