I'm agoraphobic too and have the same problem in my life. I recently had one really good friend who was pretty much my only close friend move away. I felt I could truly open up to her unlike most people. I miss her so much and barely go out any more. I'll go out some weekends to see bands. I have a lot of acquaintances in my local music scene but because of my anxieties and being shy I never seem to make any "real" friends.