Try to make eye contact to one person at a time. Work with your audience using their responses to carry you through your speech. You will live through this I have never heard of anyone actually dying at the podium. You will also not throw up, lose your pants, forget your name or catch fire. These are all things that haunt anyone who has to go before a group of people.
Performers call it the actor s nightmare.
It s perfectly normal. Use some relaxation techniques before you start If you can find a place to be alone jump up and down or stomp each foot really hard. This will ground you and release tension. Shake your hands and clench and unclench your fists. This will keep your hands from shaking too much.