I think that might be the thing. Parents whose children are more challenging might more often "be at wits end" and turn to online communities for guidance, help, or other insights, whereas parents whose children are not as challenging just breezes through, and thus do not end up as a data point online on how difficult parenthood is.

Also, even though I don't know you, I am certain that you are a good parent, and that you are doing your very best, and that your child is lucky to have you as their parent. :) Stay strong.