In all seriousness, you have NO IDEA what taking care of someone else for the rest of your life really means. You don't even know how to be completely responsible for yourself. You might think you do, but you don't. That isn't a put down, it is a simple fact. Neither of you are capable of really understanding what the next 4 years will hold for you, let alone the rest of your lives.
Wait until you are old enough to collect a paycheck and have a few real bills before you decide you are grown up enough to make those types of long term plans. You'll only know if you can truly stand each other if you get past the point where it is all fun and games . . . and believe me, at 14, it is all fun and games.
Hate to burst your bubble, but the "conversation" you had
is typical 14 year old puppy-love. Enjoy the feeling it while it lasts, but let's be realistic about it. 97% of people who feel exactly as you do at your age do not last as a couple past high school, let alone into marriage. Of the 3% (which is probably generous) that last through high school, 2.5% end in nasty divorces and lifelong recriminations about what "could have been" had they made different choices.
You could be a 0.5% freak, but I would take 200 to 1 odds that you are not.
Best thing for you is if she moves. If the two of you are a true freak of nature, you will find some way to make it last long distance. But if either of you are normal, in 6 months to a year one or both of you will have found your next "true and forever love."
Shame on me for trying to wiz on your parade, I guess --