Sit back and look at this from a wider viewpoint. Part of the problem is that you are too close to it. You are turning it into something that it is not.
Passing your driving test is important to you, I can understand that. It is not the be all and end all of your life. Everything carries on exactly the same afterwards if you fail the test, all is as it was before; you simply take another one and pass the next time.
Another thing that does not help is the fear of the unknown. Read the page about the practical driving test. The more familiar you are with the forthcoming test the better prepared for it you will be.