For me, customer service did help. It was VERY hard though. I did 5 years of it in a retail environment. I think it greatly depends on how bad your anxiety is. You sound similar to me from what you've described here, so it may very well help you too. What also helped me a lot was talking to people in any way possible - that meant text-based places like forums and IMs, and voice programs for both gaming and just chatting socially.