Well, that sucks that you feel as if you've gotten worse the last few years.
I think my social anxiety started around 12 years old. I'm 21 now, so I've had it for quite a while. I believe I've improved a lot since I got a job. Don't get me wrong, I felt so sick with anxiety my first day that I almost didn't go. Once I finally made myself walk in the door, it wasn't half as bad as I thought it would be. It's just a different environment than school where everyone has their cliques & you are constantly trying to fit in somewhere. People just seem easier to get along with when you're working together and not worried about the trivial things that don't matter (ie: the superficial highschool days.)
I think that you can definitely become less anxious in certain situations if you make yourself face the fear initially ~ certain situations will become routine and you'll maybe start to feel more comfortable in those situations....hopefully.