When I took drivers ed (The actual driving part that we had to pay for) I went outside afterschool to meet my instructor and he opened the driver's side door and told me to get in. Shortly after adjusting the seat and the mirrors, he told me to turn onto the road and we drove straight into the busy little town! I had very little idea of what to do, as I had only been on the road a couple of times before. Luckily my instructor was very nice and laid back, so he didn't make me very nervous. Sure, I was nervous to begin driving, but it helps if you are really excited about driving too. I couldn't WAIT to drive on my own. However, I've had friends who weren't really sure about driving, and there's nothing wrong with waiting. Just because you are older, doesn't mean you are more likely to get in an accident. Even though a state may say teens are ready to drive at 16 or 17 or whatever the age, doesn't mean EVERYBODY is ready to drive at that time.
Now when I took my class, it was three days in a row. Day one, we parallel parked and worked on K turns. Day two, I drove on a major highway. Day three, we reviewed it all. It was a lot all at once and I didn't necessarily remember everything I learned, but it was such a wonderful experience.
The person who really made me nervous when I started driving was my dad. He was always very calm (surprising for him!), rarely yelled, and he knew what to teach me. Problem was, he's a cop and for some reason that always scared me when I drove! LOL I always told my mom I liked driving with her better, even though she could be so nervous sometimes! I joked around saying that at least she couldn't arrest me for doing something wrong!
If you have someone who can take you to an empty parking lot to practice before you go on the road, you may find yourself a bit more relaxed with the instructor. If you can't find someone to do that with, you may want to just sit in the car (turned off) and just play with your feet on the pedals and your hands on the different shift sticks. Familiarize yourself with the location of everything in the car. This helped me tremendously when I was learning how to drive stick.
You'll survive, I'm sure you will. I couldn't imagine myself driving and now I've been on the roads for almost five years...accident free! (Except for that tree I bumped into when I was backing up, but don't worry, things WILL happen. You just have to drive responsibly and feel confident behind the wheel)