[Tangurena2]

For me, it took practice.

I used to be incredibly shy and had extreme difficulty talking to strangers. When I attended a police academy, the instructors noticed it immediately and attempted to humiliate me until I dropped out. I didn't. Later I got a job that required speaking in front of groups - basically teaching mechanics & technicians how to diagnose and repair electrical/electronic problems in automobiles. I was still shy and anxious about speaking in front of others, but I did it anyway.

Several other people have mentioned Toastmasters. This is an organization that exists to help people gain the skills & confidence to speak in front of strangers. Or just your coworkers. Some companies host their own chapter of Toastmasters.

https://www.toastmasters.org/