I have as much anxiety about posting as I do about talking to people I’ve never met (A lot). I feel uncomfortable with two word responses “nice work”, “I like it”. I am not an artist and have no art of my own. I don’t feel like I have anything to say, and if I do, I don’t know that anyone wants to hear it.
I lurk mainly because I don’t have anything new to bring to a conversation or interesting content, so I just upvote and scroll.
I mainly do the same thing, though I do comment sometimes on porn that interests me, even if it’s not something new to the conversation, some comments are better than no comments.