I have phone and social anxiety myself. My wife on the other hand has general anxiety disorder and takes medication for it. I've slowly been getting better at going in stores by myself, but I'm still not 100% where I should be. I also hate talking on the phone, and would rather text. I think anxiety stems from environmental and genetic traits. My mom was always outgoing and social, but my father wasn't. I think I got it from him if we go with genetics playing a part.