Why do girls ask guys out before they get a chance too?

All the girls are asking the guys out first and they usually say yes.Aren’t the guys suppose to do that? My friend’s go up to guys and ask them out and then the guy says yes and they only go out in school and not out! That’s not boyfriend and girlfriend! That’s not dating!? I like alot of guys but I don’t want to ask them out..it’s too awkward for me :P
Well sure,I might want to go out with someone but I don’t want to ask them out because I’m scared if they might reject me.That probally wouldn’t happen but I’m scared it might.I’m really confused. Help!