Stop trying to impress your audience and just simply be with them.
Open with a great fact, a quote, or a story that will draw them in to your presentation. Instead of trying to wow them with your intellect, you need to concentrate on being enticing.
Remember, the more relaxed you are, the more relaxed your audience will be. So just imagine speaking to them like you would to a friend over a cup of coffee and have fun!
How would your life change if whenever you spoke people took action on what you said?