When I was younger and had to do a class talk or something, Dad used to tell me to imagine everyone in the audience dressed as a clown. The reasoning being that it makes the audience a lot less scary. It didn't work for me 😄. Or you could look at just above the back of the audience, which gives the impression that you're interacting with the audience.
Something else that you may find useful is the fact that excitement and nervousness are exactly the same emotion, the only difference is the label we attach to them.
Best of luck anyway 👍