Oh man, social awkwardness... Yeah, that's a tough one to overcome since you constantly have to go outside your comfort zone and be able to put it behind you if you do accidentally say something silly.
I was forced to get through it for my job. There's a lot of talking on the phone and I'll admit I inwardly panicked every time that damn thing rang and I had to answer it. Then again, not being able to see the person really helped and I've noticed that little practice I get at work has helped me when I'm face to face with someone.