Fear of public situations

I'm preparing today for a presentation that is planned for Saturday. It's about a course that I have to explain to my classmates. Although it's a simple course and I know all the people there, I'm really worried about it. Public situations are scary for me, and I'm usually afraid of speaking in front of a lot of people and to be the center of attention. I know it's a natural feeling and that the best actors, musicians and artists have such a feeling when they perform. at scene and Knowing this has calmed  that is releasing me a bit. So I'll try to beat that fear by good preparation and self-control, and I hope I'll have no problem during my presentation.