The opposite is uncertainty or doubt. This is true for confidence, the feeling, as well. It's not cheating to plan and prepare or work out what you'll say beforehand. And each time you get through a difficult situation you become more confident.
People love being asked for their opinions.
They'll think you're fascinating . And there's nothing wrong with being a listener. But perhaps most important is that draws your attention off anxious and self-critical thoughts. It's this split that can immobilize you. Count the number of people wearing blue or the light bulbs in the room.