I apologize as this message got lost in my inbox; I just found it now as I was cleaning it up.
Just remember that everyone has to do presentations, not just you, and your teacher should be understanding of your concerns. If they are unaware, please speak to them so they can help you out too. While you will not have to complete presentations in the future on a book you read or this one historical event you researched, etc, presentations are meant to prepare you for any sort of public speaking you will need to do in the future. Most careers require you to speak to people, and presentations in a safe environment with teachers to help you can really help you prepare for that, rather than for the first time when your job is on the line in the future.
It’s all about preparation. Good luck.
Teaching In Real Life 