First of all, anxiety is real. Unless you have anxiety or are close to someone with anxiety you don’t really understand how or why their reactions are the way they are. I have a biological anxiety disorder, so I don’t know what it’s like not to have anxiety. Imagine doing something that makes you moderately anxious, taking a final exam that will make or break your grade. That level of anxiety is my normal starting point. Being constantly anxious is something I will always have to deal with, and I’ll be the first to admit sometimes I have some, um, memorable and funny reactions.
So to answer everyone's question, no one doesn't just stop being anxious.