Just relax and enjoy the classroom activities as well as the behind-the-wheel part of the class. Most students are eager to learn about driving because it is something that they want to do.
Some students are concerned about other students being better drivers or having more knowledge about driving. The instructor knows that the class has students of different knowledge and ability levels, i.e., you aren't competing against other students, you are trying to improve your personal skills and knowledge.
Having the instructor administer the driver test should help you to relax, if this is an option in your area. Anyhow, this should be a fun activity, not something to worry about.
After you get your license, paying for a car, the repairs, and insurance may cause a little stress! Taking the driver education class should help you get a discount on your family auto insurance. That should make you smile!