I am interested in a girl I have known almost my whole life; advice please?

[Throwaway2000]

BACKSTORY: My mom went to Haverford, made a big group of friends that lasted for life. Everyone married and had kids, and we all get together for New Years, a Bat Mitzvah or two, we used to go down to a beach house once every two years. We (the kids, there are 9 of us ranging from ages 12 to 20) were brought up knowing each other, seeing each other every 6 months to a year, and we're all solid friends, except we always get together as part of the Haverford crowd, never as two or three teenage friends.

THE GIRL: I am a 14 year old guy, she is 12. Not pedophilia, but a big difference at this time in our lives. She's really funny in a sarcastic and outgoing way, laughs easily, generally a bright and energetic person. She's completely un-self-conscious, like at a party when she started doing vegetable yoga positions that made everyone who knew her laugh and everyone else give her some pretty odd looks. I am awkward. I'm relatively tall, but I have thick glasses and am in advanced classes (Precalculus Honors freshman year), so everyone pegs me as a nerd. This girl doesn't know the nerd, only a darkly sarcastic, easy to laugh (with the Haverford crowd, almost everything that's said is funny), tall, a little bit awkward guy. So my question is: how do I ask her for her number or ask her out after knowing her for years? I've never even asked out anyone else (too awkward, sigh), so I have no idea how to do this. Thanks for any potential answers!

EDIT: forgot to mention that she lives about 2 1/2 hours away from me, which basically voids SethfromMI's response.

[SethfromMI]

well is there an event more movie or something you could take her too which she may be interested in? if so that would be a perfect opportunity and excuse to get her number. if you know a lot about her think about what she may want to do sometime and then try to set something up, even if it is just going to her house or her coming over to yours

[Throwaway2000]

Forgot to mention that she lives about 2 1/2 hours away from me, so that basically voids your response. The only contact info that I could possibly get without actually going to her house is her parents' emails/numbers, so that's not helpful. Thanks for the response nonetheless.

[Polski101]

I don't want to ruin anything for you, but are you sure that you could deals break up between you both if you were together. I don't want to say don't go for it because not only is it your choice but I want any couple to be as happy as they can be together but where I'm coming from is that a previous relationship to a girl I'd know for a major part of my life (considering I love in a different country to where I was born I haven't physically known her all my life yet feel like I have) made me devistated when we ended our relationship. Not only did I put my love and trust in her, she through it back at me by cheating (again, saying that my ex cheated doesn't mean she will) and it ended me with a major trust issue, with other factors being accounted in this. I feel that if we hadn't of had a relationship between us, we would of been best of friends, and although we do remain contact, I feel very distanced from her because since she left me, her life has gone downhill. That is what can happen if you've known each other too long, it's basically being friend zoned without even knowing you've done it to each other, could you cope if that was the case.

I will always support you in whatever step you may take and wish you all the best, like I say I'm not trying to put you off but maybe something to think about.
Best wishes and good luck.