Just about everyone is. In fact, it's the most common fear. A big part of this fear comes from the fact that most people only have to speak once or twice a year. They don't know how to prepare and they don't know all the tricks the pros use to warm up the audience (I do it before I even get in the state where I'm speaking). They also don't know all the techniques professionals use to create a home run presentation every time. All these things can be learned. When you are really prepared, the nervousness is reduced immensely and disappears altogether within a few minutes after you start.