It seems to me like those were just honest mistakes a nervous driver might make. It's not like you have some fundamental misunderstanding about how to operate a car.
My suggestion is to work on your mindset before you take the test. Your nerves are going to be worse the third time around, so you'll be more likely to make another mistake. Practicing as much as you can is the best way to feel more comfortable. Just go out to an empty parking lot and get a feel for how much space you have, versus how much you think you have, and looking for stop signs and pedestrians, and all of those little things that are easy to overlook as a beginner.
Also, before the test, tell yourself a few times that you're not nervous, you're excited. To your brain, the feelings are pretty similar, so it's a good way to trick yourself. It makes you less likely to make unnecessary mistakes. And don't think of failing as the absolute worst case scenario, even if it is. If you tell yourself it's okay to fail, you'll feel more relaxed while taking the test.
Best of luck! I hope things go better on your next test.