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I used to be an introvert. When my family walked into church and the pastor told us to “mingle,” dread crawled up my spine. At parties, I sat alone and pretended to be okay with remaining silent. Fear kept me from speaking the first words, and I watched the faces going by, hoping a friend would break away from their cliques to talk to me. I used to be an introvert. In some ways, I still am. But I...