Why are boys so afraid of getting rejected?

Like Ik it's kinda sad when u find out ur crush doesn't like you, but it's not the end of the world. Most of the girls in my school get over it within the same day or next day. when I see so many guys say they're afraid to approach their crush bc they're afraid of getting rejected. You're not going to die. I've gotten rejected plenty of times and I'm still breathing. So many girls in my school have to be the ones confessing now, so now a lot of girls don't even bother

Edit: I rlly don't get it, like ur not going to know half these people when you graduate anyways