My social anxiety disappeared — I stopped shaking when talking to people

Where the hell did my social anxiety disappear? Why do i not shake anymore when talking to people? And why holding eye contact and standing straight up is so natural? I am so assertive with annoying customers on the phone, when they argue with me, i keep the respect, i stay calm and I don't let them anger me, i resolve the issue and they usually understand my points. Talking with the co workers used to be difficult, im 24 (almost) and everyone else are 40-50, now it's not nerve wracking anymore and actually very fun, they are funny people when you let loose. When i read today the quote "i came, i saw, i conquered" i felt something deep in me wanting to break free.