I'm socially awkward in that sometimes I force myself to start a sentence I haven't rehearsed and then stop halfway through it and just sit there looking stupid because my mind goes blank.
I'm socially anxious in that I have to rehearse everything I say before I say it or that will happen.
I'm socially awkward in that even when I think I have fully rehearsed and prepared for what needs to be said, it happens anyway because my mind goes blank anyway.
I'm socially anxious in that I worry that even if everything I rehearsed goes off without a hitch the person will ask me a question I wasn't expecting and I will just stand there with a blank look on my face looking stupid.
I'm socially awkward in that if that actually happens, I will probably say something like "See ya later" or "I gotta go" or "good" and start to walk away and trip over my own feet and almost fall over.
I'm socially anxious in that I will see this whole encounter coming two weeks ahead of time and worry about it the whole time.