what do you do when you're nervous

so i was giving a speech the other day and my friend gave me the age old advice to picture them all rocking their birthday suits if i was nervous. Really? That's suppose to put my fears at ease. 50 people in the buff is suppsoe to make me feel calm. I mean who feels comfortable in a room full of naked people? If i was surrounded by dangling body parts all i'd be thinking is why aren't I showing my tidbits. Whoever came up with that anxiety cure-all must have been a nudist, cause any non-nudist wouldn't be able to say anything when they were eye to eye with that much pubic hair. although i do wonder if you're giving a speech at a nudist colony and you're nervous, do you picture them all clothed? Seriously that question is going to keep me up nights.