I worry the same way, but mostly just when I'm commenting on something hurtful. Like if a commenter is being agonizingly wrong about something really important, spreading lies, you know the kind. I'll get worked up and start writing a comment, but realize that any point I make can be nitpicked and invalidated even if it's broadly correct. So I don't post those comments.

But when it's not in response to someone being inflammatory, I feel better about just doing my best with what I write. If someone has a correction, well that's a good thing! I'll acknowledge it and edit my comment to include the better info I'm given. I can hope that the people reading it don't see that I was wrong on one point and decide I'm completely wrong because I try to interact respectfully.