IM's are my lifeline. I couldn't get by without them. They're my link to the world. I turned to them early on because I have a speech problem, and they were the one way I could talk with people and not be judged and made fun of because of my speech. I started using them before I really developed my social fears, so I got used to it. By the time I talk with someone on voice, they already know me well enough that they don't care. Granted, I've screwed up plenty of times and made people mad, and been banned from a few places when I was younger, but I've learned. I find I tend to connect with certain individuals, even over IM. But only certain types of people. I make a few strong friends, but not very many. At least I can simply block the annoying people. Except when said annoying person is an administrator on a forum you moderate. . .
My information hoarding, writing skills, and dependability have seen me placed in a few positions of trust in Internet communities, although I tend to screw up because of my social problems. In other words, I tend to rise to the top in Internet groups, but I don't stay there because I screw up, particularly under pressure.
My advice, if you want to try desensitizing yourself: try chatrooms. It's a lot less committal than IM. You can pick and choose what you respond to, as it suits you. And it gets you used to a faster paced conversation. Because you're not the only person maintaining the conversation, you're under no pressure to respond if you don't feel comfortable.
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Heart of the guardian, way of the warden, path of the exile.