Believe it or not, your question is somewhat relevant to a message board about SAS programming. SAS programmers are sometimes called upon to present their work (or perhaps go on job interviews), and can be equally nervous.
First, realize that speaking in front of people is a necessary skill. And remember, it could be much, much worse. The teacher might be asking you to tell the other students about yourself instead of reading a paragraph. If this doesn't happen in a classroom, it will happen in real life. So be determined to improve. At any rate, practice using very, very small steps. For example, start by reading a paragraph out loud when you are alone. Practice until you are a little more comfortable than you were ... it might take 20 paragraphs to get there. Then add to that little by little in any way that you can. If it is more difficult, practice reading a paragraph when a pet is in the room with you. That's how small the steps should be. Practice reading a paragraph when a family member (or perhaps a friend if that is easier) is in the next room. Then practice reading a paragraph when a family member (or a friend) is in the same room. Eventually make it more than one family member (or friend, or a combination). You don't have to become perfect at any of these steps ... just better and more comfortable than you were before. Take in in tiny steps, and gradually take on a more difficult setting. After making some progress, you will probably go back to the beginning, most basic step and cycle through the steps again to become more comfortable. If you work at it, you will get there.
Good luck.