How do i approach a girl to make her know me better?

[promuelchoo@ymailecom]

I have a crush on this girl but she dun know me that well,she is quiet and well-mannered.I wan to ask her out on valentines but i dun really know her so wat shud i do now,just wan to try to get close to her,but she is always surrounded by her frens, im shy to go to her