Do I have to break up with my girlfriend?

I am currently attending college and my girlfriend is still in Highschool about an hour away from where I live. We've been away for only 2 weeks. We've been dating for almost 2 years but i'm starting to feel a bit distant with her maybe cuz its a long distant relationship. We fought recently and we are taking a month break but it doesnt seem to make me sad at all. I dont even know if I love her or not. But when I think of her with another guy, I get mad and jealous. I honestly dont really like her personality too. I just dont think were meant for each other. But idk.. 2 years is a long time and I feel as if a part of something is missing in my life without her.. but i feel that I need to break up with her in order for me to do well in college and because I know we will eventually break up one day. When im with her.. I dont feel any attractions but when I think of losing her the whole worlds seems to be crumbling down. I dont know what to do now. Any suggestions guys?