This is how most of us people got boyfriends in 3 weeks!

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[edit] Steps

Start a normal conversation and ask him simple questions.
After a week or two ask him if he considers you a friend If he says yes you're doing well, if not, sorry!
Be flirty! Ask him who he likes! Then if he asks you if you think someone is cute say, "maybe I do, maybe I don't."
Make sure you flirt back when he flirts with you!
After about two weeks, plan a day somewhere with your friends and him and his friends.But make shure that he doesnt notice that your trying to set up a date.
Don't be shy. Tell him you like him after three weeks and maybe he'll feel the same way.
dont hide your face when he is around guys like a girl who loves herself her body and the way she looks that will give him a even greater reason to like you...so be confident

Flirt with him more after the first two weeks.
Get a haircut or buy some new clothes.
Don't feel pressure and act relaxed around him.
Laugh at his jokes only if they are funny (you don't want to seem desperate!).
This is also a good time to build up your confidence so you won't be shy to ask him out.
be confident in who you are.

If he doesn't even know you exist, make him notice you! If he takes interest, keep going, if not it just wasnt meant to be.
Don't get too playful.
Don't try to be someone else.
If you think he doesnt like you...you might be right so back off a little