Deliver your well crafted speech clearly and compellingly, with a resonant voice and good pacing.
Make every person in your audience feel that you are speaking directly to them. Keep them on the edge of their seats.
You can do this! Most of the same performance anxiety issues exist in both Public Speaking and Singing.
I teach Overcoming Performance Anxiety on an almost daily basis.
Experience the excitement of speaking publicly when confident about your speaking skills and ability to overcome performance anxiety.