You may be surprised to learn how many people are nervous when they start to learn to drive, it is quite a normal sensation to feel. Despite you having been a passenger either in the back or the front of the car for years when it is your turn to take the responsibility of driving everything you have previously experienced no longer counts.
You see, human beings were not designed for speed, or negotiating objects whizzing towards us at high velocity, so what happens is your central nervous system asking if this right and safe? That's the nerves kicking in, and all it's asking is, "Are you safe and are you in control?"
My driving lesson course for people who are suffering from nerves is managed specifically so you can start to take control and feel comfortable with your driving. You will soon feel at ease and those anxious feelings will vanish.