But anyone who has an opinion on a particular case is usually excused from serving on the jury for that particular case anyway.
Yes to all the above. Your introspection serves you well.
You should use it more often, especially in that moment before you give people reason to call you on being such a fool.
Or is it too late for that?
Sadly, the difference between ignorant and stupid is unfortunately terminal. Like the wise man once said, "You just can't fix stupid."