Hi. You are definitely not alone. I also work in a call center and an introvert to boot and it is absolutely brutal. My ex therapist suggested that I change departments, which I did. Took a lot of courage and made me extremely anxious, but I don't regret it. It was better for a time. I would say try to see if you can change departments (if at all possible). In the meantime, it might be time for a new job, or to go take some online courses/go back to school. Good luck to you.