Alright dude make sure she likes you, second make sure she does not have a boyfriend and talk to her a lot bring her a flower or give her the chocolates. Dont be so nervious around her if you are try to make her laugh, Girls fall in love with the littlest things about a guy, girls will fall inlove with you without themselves knowing it when your funny.
Thats how i got my girlfriend next month we will make a year i was only one of those funny type of guys and little while after i started liking her a lot and she told me she liked me, then the day before valentines day i asked her out and she said yes. I believe in you, you can do it and finding a girl you really like. Good luck dude
