Public speaking provides only its subject to hide behind, and relies entirely on the speaker’s voice for expression. It’s no wondering the fright hits the speakers so hard, and entirely understandable.
Just remember. You and the audience are still people, and they genuinely don’t want you to fail. You shouldn’t want yourself to fail, either. Keep your chin up, keep the fear inside and don’t show one bit of the fright, and you’ll be fine.
The stage isn’t a thing to be feared. It’s just a thing, made by humans for humans to use. Nobody ever died of stages or stage fright, after all. Smile, nod, and speak. That’s all there is to it.