I don't know about this

I wonder if I am the only one that feels like this sometimes. Today was a good experience but was also discouraging. Can I really do this? Am I ever going to be able to clean people's teeth? Am I going to graduate? am I going to pass the boards? I learned a lot today and I learned that I do not go interproximal enough. I did 4 quads of a class II today. I don't know if he was just a really hard class II or if I just suck-probably the later. My patient was awesome and really cooperative, but I wasn't doing as well as I would have liked. The instructor kept telling me I was doing great and was right where I should be, but I honestly feel like I should be able to do everything right the first time, but I have to remember that I am learning and that is why I am here. at least I didn't miss every spot just quite a few.