Many professors and even professional speakers have the fear of public speaking, having delivered a number of educational talks myself, i can tell you that it can be daunting. So rest assured you are not the only one.
Coming to what can you do about it.
- Practice and be prepared for your presentations. Even the most skilled speakers put in a lot of hours in their presentations practicing.
- I would suggest you to join toastmasters which is a communication and leadership platform . IT is structured mainly to improve your public speaking skills and improve your confidence.
Hope this helps.