Are you terrified at the thought of giving a presentation before a live audience? If so you are far from alone as even professionals with many presentations under their belt and veteran actors and acresses. The difference is that know how to overcome this.
Properly controlled such nervousness caused by an extra dump of adrenalin into your system can even stimulate you to give an extraordinarly moving and persuasive presentation. Some speakers control this nervousness through a little, usually unoticeable, ritual of wrist and ankle shaking to keep their bodies loose and flexible. Others go for a walk outside or around the building to keep their body relaxed. Nearly all practice deep breathing prior to the start of their presentation to flood their brain with oxygen so they can think more clearly. You can do all of these things too.
But the most important keys of all are to know the key points of your presentation so well you can deliver it with few or no notes at all and then visualizing yourself standing before an audience and delivering that presentation, bringing out those key points arguments, illustrations, and examples as well as responding to any questions from the audience. Picture yourself interacting with different persons in your audience.
Athletes use such visualization as they practice jumps, hurdles, and other movements before the day of the competition. And the most successful are often those who make extensive use of this technique.
You can use it too before your presentation. Then any paralizing fear of speaking in front of an audience will fade away.