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been seeing this girl almost everyday for about 3 weeks and i want to make her my girlfriend. any suggestions on how to say it or ask? i don't wanna sound stupid or corny.
It's not that you sound stupid or corny--though as a confirmed "I don't do GFs" person I would ask "are you sure"?--but that the question is too big and too vague to answer meaningfully. You haven't provided enough information. Even when you say you've been "seeing her" every day for 3 weeks, I don't know if you mean you have had intimate/sexual contact with her every day for 3 weeks, you have been taking her on a lot of dates, she has been hanging out at your place, or you see her down the hall at work!
So, assuming the best case scenario--you have been seeing her romantically and are sleeping with her--and you want her as your GF, then you (1) build rapport (check out Gambler's vid's on this, he has it down, largely because he does not much go in for it himself), and then (2) work out some kind of understanding about what the relationship means by using your words to negotiate what you want (exclusive? what are your expectations? and what are hers?)