That's a great resource available on CiteHR. I suggest you start public speaking in your college. That's going to enhance your self-confidence. We all like to think that we know our stuff, and many people do. But that alone will not engage your audience. The research indicates that only 7% of your presentation's impact will be from your words. Only 7%... This is concerning for subject matter experts. For the new or inexperienced speaker, eye contact is one of the hardest aspects of speaking.
Good luck.