Be confident about the topic which you discuss or presenting to the crowd. Presentation is a skill to be developed by an individual,
The content of the presentation really matters and don't think about the questions which will be posted towards you. Most think about that too and due to this nervous comes in. And also create a free flow in you presentation from start till end and have the connections between the points when you go around the presentations
You can always practice in front of the mirror to gain the confidence as well as to remove the stage fear.