I need Drivers ed help?!?

I'm taking drivers ed. I started two days ago and I drive every other day. For another month. I'm a good driver, as my parents say but I'm not when I drive with the instructor. I mean he always has to correct me on things and the kids in the backseat just laugh and giggle. It irritates me because I'm so nervous that I always make mistakes. I'm scared I'll fail. What can I do? and What does the instructor look for?