From everything I've experienced and everything I've read / studied, that's normal. You're going to encounter at least some degree of nervousness / anxiety. The key is to find ways of telling your body that there's no imminent threat and to focus on providing value to individuals. Remembering a few people you know personally that could benefit from the topic is often helpful for me, but you're still going to have that anxiety, though it decreases with repetition.
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