Nerves

Here is how I relate to you and I "think" I know where your coming from. Even when your by yourself, you are going to be anxious. You probably aren't doing as bad as you may think. When I was first being taught to drive, I would get so anxious and upset that I would literally get nosebleeds. Simple (but difficult to do) don't try to worry about what this person may be thinking about your driving or performance. You are putting added pressure on yourself. I am right? Thoughts going through your head "what if I don't do this just right, what his he/she going to think?" What will they think about my skills if they hear or see me miss a gear or gears?" What will they think if I can't get into the dock on the first try and it takes me 20-30 minutes?" Most of your learning(aside from the basics) will come as you go through the processes on you own. There is going to be that difficult dock to get into, backing into a dock across a street that you will have to block traffic on (what are those car drivers going to think if I keep holding them up?) Focus on your task at hand. Be as safe as a driver as YOU can. Be responsible as a driver. Everything else, (other people etc..) block from your thought process and just focus on the task at hand. As your career progresses, things will settle in and you will gradually feel more comfortable. Just please don't ever get to comfortable, you may lose your edge as a safe professional driver.
Be safe.
Toby