To answer your question, YES.
I used to have so much social anxiety that I would not leave the house, or answer the door or phone. I used to be afraid of traveling, because I needed routine and familiarity. I used to be terrified of having my picture taken, because I'd been hassled so much for not making the right facial expressions. I used to be unable to talk to strangers.
I became a professional traveling model. I forced myself to be in front of the camera, to learn to express myself through my face, to learn to travel and interact with different photographers/artists every single day, to learn to talk to people so they'd want to book me again or recommend me to others. I really came out of my shell, and I'm a million times less "shy" than I used to be.
I'm still awkward in some ways. I still hate small talk, handshakes, eye contact, etc.. but I have found little tricks to make it easier. Sometimes some people pick up on my inability to "chat" with them about nothing though, and they perceive me as rude or stuck-up. My friends usually just say I'm "shy" as an explanation.
I still do things like the pacing and having conversations with myself when I'm alone. This HELPS me with my writing though, so I'm ok with it. I stim by constantly being on my iPhone when I'm in stressful situations. This is becoming common in society though, so nobody thinks I'm being unusual.. maybe just a little rude/antisocial. But my friends are understanding, and that is what matters. I didn't even HAVE friends a few years ago. The modeling became one of my special interests, and I was able to bond with an entire community of models/photographers who shared that passion. I still have a lot of trouble making friends with people who don't share that interest though! I don't know what to talk about with regular people, unless we can discuss art in another form.. like music or literature.