Chickening out...

So, I like a girl and want to ask her out... I get scared and end up not asking and saying goodbye. How many people feel this way or went through exactly this? I'm sure a lot of people! Anyone wanting to ask someone out! Y is it sooo terrifying to ask someone out? The worst they can say is NO! But, for some reason people get terrified. That feeling sucks! People should have confidence and especially in themselves! If u like someone... Don't chicken out! Man up or woman up and do it! Just ask! Let me know if this works... ;) btw only ask if ur friends with the person and theirs been signs of more than friend potential xD otherwise, it won't work.