I am going to answer only the first question, because thats the only thing I have experience with, but I am sure there are others here who can help with the second part.
You need to find yourself because you are 20. The cure for that, as well as self-assurance, is time and learning. And patience.
Worrying if you are doing a good job is a sign of a good Dom and a person who cares. It is not a sign of weakness, but assurance to your sub that she can trust you with herself.
Welcome to the Library,
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