Scared for our relationship

I have been really doubting my relationship with my girlfriend lately…it seems like we’re kind of growing apart. We kind of live 50 miles away from each other, its a long distance relationship. I mean, before, we used to share all the same interests, I play guitar, and she plays drums, and we play together, its awesome, we can start straying away from the song itself and just improvise, and make it our own, but our music interests are starting to slip farther away, shes going more into indie style, kinda like Death Cab For Cutie, and softer rock than what I like, like Hinder, Matchbox 20, and I have been growing into a metalhead, with stuff like Shadows Fall, Metallica(old and new), Iron Maiden, Megadeth and so on so forth. That doesnt seem like a big issue to most, but when I realized this, I started to realize that our personalities are growing away too. She wants to go to a “really nice college”, which I dont have trouble with, because im hoping I can get into a college period, and just close by. I’m not picky with my higher education, and she wants me to “apply myself more” in high school. Again, this also doesnt seem like an issue, but sometimes it scares me how different we are at times.