I am on a gig right now. The life of an itinerant performing artist is a constant flow of:
wishing you had a gig...It is a strange, strange life we lead.
deep dread of doing the gig...
the odd exhilaration/stress/loneliness of being on a gig...
and then the sadness that the gig is over.
I believe this is exacerbated when one is an introvert by nature.
There are tons of great articles about this online, but the gist for me is this: though I like people and enjoy spending time with people, it is a drain on my energy. I get "recharged" in my alone time. Extroverts feel the opposite and think that people like me are insane. hahahahha
This Huffington Post article is enlightening: Six Things You Thought Wrong about Introverts.
And of course there is a BuzzFeed for that: 27 Problems Only Introverts will Understand.