I was diagnosed with both Social Anxiety Disorder and Generalized Anxiety Disorder but I don't really feel much of a difference between them. I tend to worry about everything, including what other people think. The only difference I can see is the way they manifest themselves in my life; SAD makes me avoid all social situations and events wherever possible because they're so uncomfortable, while there's really not much I can do to avoid more generalized anxiety so it gives me insomnia.