Hey, i dont think that she is more independent than the other girls, i think the problem is that you are more into her, and that (as you discribed it) want to be with her all the time!

I mean its nice and i am sure she apreciates it, but it is frustrating as well. It is not good for both of you to stay together and do everything together 24/7. You need to have some time apart, and it is this which you have to get used to!

Go out with your friends, go out and have fun with friends, im not telling you to go out and pick up another girl but have a life outside your gf.

By doing so you will understand her even more, and you would not get so angry at every little thing she does without you, because you will be doing the same!

Living apart form each other is difficult, so take the time to go next to her, even though its 45min away! Being together for a while might help this sticky situation, its better than talking about it on the phone!

Anyway goodluck, and remember you said youd do anything for her, so be happy she is making friends and having a good time at collage, and do the same yourself!