I'm the same - I always have been. I am just very uncomfortable using the telephone and will put it off as long as possible, even when it's just stuff like ringing the doctor, getting in touch with Mr Viper to pick up some bread on the way home etc.
If I have to query something/ have a dispute etc, I get myself worked up into a terrible state.
It's ridiculous, and i know it is, but I can't help it.