I can appreciate how frustrating your situation must be. Note, though, that even though you feel uncomfortable, you ARE able to sit in offices! That's an accomplishment you can be proud of and a great beginning! Some folks can't do that. You have made progress.
I'm sure more people than you think experience feelings like yours.
Stick with your CBT and continue to work on your self-esteem is what I suggest.
Although I never was diagnosed with social phobia, I used to be very shy, a wall flower. After a number of years of talk therapy, I am very bold and can talk to anybody. It CAN be done. Okay?