There is a reversal at play. Everything man wants is what a woman truly wants, and everything a woman wants is what a man truly wants. We notice this in each other because it is something of ourselves.

Girls want certain things in a certain order.

Girls want:
Your attention (undivided), but not for too long.
To be told they look nice.
Something pretty to look at.
Something nice to eat.
Something interesting in their lives.
Some space to be themselves.
A future.

Don't you want the same things?

Get her to be excited by seeing you:
Women trust their bodies. If their body is attracted to you they will be too.
Use Pavlov's psychological discoveries to your advantage - be nice to her every time you see her, but don't overdo it. Gently, but firmly.
Give her something small and pretty, or something sweet or chocolately - anything to engage her finer senses.
After a while, every time she sees you her body will automatically react with the excitement of the gift. (Pavlovian response) Now she's REALLY curious about you because you excite her senses.

NOW BACK OFF

Let her miss you a little. Her mind and body, now accustomed to those nice things about you, will tell her that life is worse when you're not around. She needs to know this. Let her come to you.

If she doesn't come to you:
COME BACK IN A BIG WAY

Excite her. Ask her to a movie.
DON'T EVER TELL HER 'JUST AS FRIENDS'.
She must know you want more than friendship, even if you're too shy to tell her. If she says no, don't worry. Back off a little, and come back slowly. Keep at it. Keep being the nice, strong guy.

Things will fall into place. She will like you more and more.

I'M UGLY.
Usually she feels ugly too. Give her pretty things to look at. Let her forget the ugliness.

Be Persistent, but space it out, leave breathing room.

Now, when none of that works, realise you can't get a girl to like you, no more than you can change the seasons or stem the tide. But if you are truly you maybe she will let you like her.

~Zen