No!! Go for it! Girls can definitely ask guys out. Sometimes guys are just too shy or afraid of rejection and you gotta put yourself out there. girl power!! :D good luck! (also guys like girls who aren't all shy and stuff they like when girls ask it shows strong personality)
Okay, here's the real deal: it's not wrong, but it will/might give the guy the idea that you're more into him than you are. Young men are frequently jerks when they believe that the girl is more into them than they are to the young lady. So is it wrong or immoral? No. Is it a bad idea if you want the guy for more than a fling? Probably.