Wow, that's kind of rough, kid. I have two pieces of advice for you, take them or leave them:
1) To begin with, it is obvious that you love this girl a lot, since you did not follow your dreams, but rather, her. Anyone that tells you that you did the wrong thing by not following your dreams and going to "your" school does not understand love. YOu make sacrifices for love. It is the way thigns are. It is a two-way street, though, and if you made a sacrifice for her, and she does not appreciate it enough to go to another (different) school when you specifically did not go to your school so you could be with her??? My guess is that she doesn't love and appreciate you nearly as much as you do her. She is obviously unwilling to sacrifice for you.
Which brings me to two...
2.) Go to your school. Do your thing. It is the perfect test for your relationship. If she can't/won't make the effort to share some of the financial burden to make the distance thing work (IE, HER coming to see YOU every once in a while instead of YOu only going to see HER, like it sounds like the plan would be in your post) then she doesn't care. The first year of college changes a lot of things. YOu will change a lot. Not to jinx your relationship, but I have dollars to doughnuts that you either fall out of love for her, or she falls out of love with you, regardless of proximity (even if you were going to the same school!) If this doesn't happen, then you know your relationship is a good one, and you can rest assured that you've found the woman for you.
Relationships are all about give and take. From the way you described the fact that "you wouldn't be able to afford making the trip twice a week to come see her" (making it sound like she would be unwilling to make the trip one of those times each week to come see you, instead, and share the financial burden) and the way she would not compromise for you on the school choice like you would for her, it sounds like this relationship is based on YOU give, and HER take.
You need to have a talk with her. It sounds to me like you may be under the influence of a little "institutional pussy-whuppness" (I mean no offense, it happens to nice guys that care for their girls like you, who make sacrifices and effort to keep her happy) because YOU changed schools, YOU make the trip to go see her, and she is obviously pretty unappreciative. Don't be mad, don't be a jerk. Just let her know how you feel, that you are making the effort, and that she doesn't seem to care, and it is making you feel a little unappreciated and marginalized. Don't let it fester or continue to bug you, because it will just get worse to a boiling point, you'll blow up, and nothing will be better off for it in the end...