Nah, I've had too much practice. You soon get used to it.
But when I was a teen the thought of getting up before a crowd would have terrified me. I was so shy I used to mumble, even in normal conversation, in case I said something embarrassing. But I got lucky, I met this little blonde who took it on herself to knock my confidence into shape. These days she claims she over-did it. She's probably right.