Is there a meditation course for confidence?

Yes. Confidence and self-belief is one of the goal areas a course can be built around. It works well as a course rather than a single session, because confidence shifts through repeated contact with how you speak to yourself rather than in one sitting. Loving-kindness is often the more direct route, since it works on the tone of that inner commentary. In StillMind you can build either a Goal-based course around a confidence goal you describe in your own words, or a Loving-kindness course. If you say you are hard on yourself, that course can start with someone who has been kind to you rather than with you, because goodwill is easier to feel toward someone else first, and it comes back to you once the practice has steadied.