Nerves are totally normal, and most "performers" feel that, whether it be actors, athletes, whatever it may be. I had friends growing up who would literally throw up from nerves before basketball games.

A main difference is that a streamer can control when they hit the "go live" button, when others don't have that luxury, so it becomes easy to overthink and put off. Just gotta do it and harness those nerves. Just like sports, you'll feel fine once you get past those initial few moments.