Not to worry. You should not give up, I am sure you are capable. I used to be nervous about driving as well and after failing first test I changed my instructor ( he started to annoy me ) and carried on with my housemate's driving instructor and that lady was simply amazing!!! She was so cool and calm, just made for the job, I gained more confidence and was able to do it. I knew I will pass on my second attempt. So for you I would advice maybe changing an instructor, for me it was vital in my progression. I still get nervous in heavy traffic, but much much much less. Because I just go and do it. You need to practice maybe using the same routes, as you know where you going or go somewhere quieter. Finally you'll be able to feel confident on the road in any situation/ condition. It took me some time even after passing my test I needed to work in it but it was well worth it. Good luck !