I believe this is the thesis statement because of the overall meaning of it. It's basically saying that we shouldn't try to be someone we aren't. Why try to be someone else when we can just be ourselves? We are who we are and that's enough. Despite the embarrassment and challenges with being true to yourself, authenticity is the most important virtue to one's character. If I were to change it, I would put it as the very last sentence of the text so it would have a greater impact on the reader.