I worked in sales for a few years when I was younger before I started my actual career, I went from an introvert afraid of public speaking to completely comfortable breaking the ice with basically anyone in those years (mostly because I liked having four walls and a roof) and that led to me doing technical training/talks to strangers years later.

I still don't really like it but I also realised that dragons don't appear from portals and eat you immediately if you do it.

My missus is much like I was but she never got through it, she finds it fascinating that I can.