I feel like we had some very similar expectations. Same as you I didn't expect to get a super big audience, but I also didn't realize how tough the competition for views is. I like your analogy of "preforming for an empty theater". I just call it "farting into the void". Guess I am not the poetic type xD
I also expected more critical voices over my comic. I was super paranoid as it covers a lot of topics that are a little...politically charged. With the way the internet climate is right now, I was super worried about that and about people making assumptions about me due to the content of my comic, but it hasn't happened so far. I still get these anxieties with certain scenes, but it has died down a lot with the comic just becoming "business as usual" for me.
One expectation I can never throw off I get with every picture I make, that I am proud of or that I worked on for a long time. Every time I go: "This, is gonna be it! This page/picture took me so much work and the result is awesome! Now I will be widely recognized!" And then I go off daydreaming about success, which hasn't occurred yet. I set myself up for disappointment like that, but I can't help it. ^^ A youtuber I quite like has said "You can do everything right and still not find success" and I try to remember that in trying to stay grounded in my expectations. With mixed results 