I'm not "cured" obviously and I've still got a long way to go, but here are some changes I've noticed in the past few years: 

* When I make a mistake, I don't hold onto that mistake for a long time like I used to. I still feel embarrassed of course, but the embarrassment passes and the next day I barely even remember the mistake.
* I do stuff despite being anxious about it. I kind of just accept the awkwardness and roll with it. For example today my coworker invited me to go get lunch at a place I've never been to before, which I would usually say no to because I'm not familiar with the menu or how to order. But I went! And I ordered food! And it was fine!
* I actually believe that I'm capable of stuff and that people like me. I've kind of always operated under the assumption that people are only nice to me to be polite, and that I'm guaranteed to fail any task assigned to me. I have a greater sense of my own competence than before and I'm starting to see the things other people say they like about me. 
* I can make phone calls without my heart racing the whole time??? For the first time in my life??? Which honestly feels so weird. 
* People aren't really perceiving me as shy anymore. Quiet, yes, but being quiet is a more deliberate thing. It's more like being wise enough to know when to speak and when not to. Whereas shyness is just fear.