Well, here's my rookie opinion...

Maybe you should try being apart for a bit (well, you are apart, but you know what I mean). Just take a break from each other, see what happens. You're young, she's young, give it a try. Still talk and hang out with each other what little you can, but just try not to be quite so serious...I know I'm not much older than you, but you're far too young to be so miserable from being apart and then not knowing what she's doing and her getting upset when you do something...