This. I've spoken at international conferences and host a monthly event, and still each time before starting I'm jittery and all I can think is "I don't want to, let me go home." Once you're up there though, all that should be in your mind is the list of points you want to hit. Make your only mental goal to hit all your talking points in a clear way. You won't even realize there's an audience there; it'll just be another drill of the routine you've been practicing up to that point.