Maybe needless to add, but it's no universal solution! Not everyone with anxiety have it out of lack of experience in social situations, many but not all!
I worked in a turk-import supermarket, as well as served my mandatory serve-or-go-to-jail Norwegian military - which was full of people, all the time people, day and night people
It neither worsened nor improved much, except that stress-while-around-people was more frequent than usual
One thing that surprised me in the military, was how naggy and complainy eeeveryone else was. I was always "the wuss", according to everyone growing up, for not being a douchy jocky competitive brawler in primary school, rather the opposite, but in the military they became the biggest babies of all "waaah, I worked sooo haaard and the sarge didn't even tell me how well I did!", they would take it personally when the sarge snapped at them, and stuff "b-but D:"
They never got any praise, but me, I'm jogging half dead at the END - behind everyone, and the sarge tells me I'm going a good job :v yeah right, cus that's what it means to be last, but still, ha! :v
There were TWO guys in the entire camp that were more useless than me. I know, I sniffed them out, and kept them close to me.
(three, if we count the Saami guy, but he was really tough, he just didn't want to do anything, and used his minority status and annoying charm to rebel against the system.)
Officers still liked me tho, cus I'd take instructions like a robot.