This is an interesting question that sort of captures some of what I've been feeling recently. Since July I kinda blew up subscriber wise, like 5x growth, and suddenly I have a lot more inflammatory/uncomfortable comments to watch along with my regular thoughtful lovely commenters.
When there are suddenly thousands of people looking at your work it gets a little scary, even if you made it to get consumed. I feel like everyone's suddenly in my apartment and I haven't vacuumed and there are too many dishes in the sink.
There's also the pressure we put on ourselves to always be growing. Every time I hit a milestone, I'm like: well that's it, I've peaked, it's all gonna be downhill from here 
I've always been an ultra-private person online, so it's...an experience, and I can absolutely understand creatives fearing success. Especially since so many of us are introverted!
Lastly, the thinly veiled envy and competitiveness that suddenly comes out from some of your peers, or strangers that suddenly feel entitled to your time and help but don't even say hello first....
All that said, I'm not complaining at all! I'm SO SO lucky to have experienced all this, and I'm trying to roll with the changes! I'm just a very high-strung person
I thought I'd share so that anyone else who's experiencing the same thing or going to experience it in future might know what to expect mentally!
(disclaimer, I'm not enormous or anything, but I'm succeeding by my own standards!)