Relationship advice!

Lyndsey • Hi, I'm Lyndsey. I'm 22
So I currently moved 5hrs away from home to go to a university closer to my gf. The other day we kind of had a miscommunication, which then lead to an argument the next day. I'm usually very sexual and she's not, and I respect her boundaries. But the other day when I wanted to have sex, she didn't and it kind of hurt my feelings and my first thought was, "what's wrong with me? Why doesn't she want me?" And I asked her, and then proceeded to ask her if that bothered her. Then she said no, but later she said it did and I'm just wondering what I can do? I guess, to try to put myself in her shoes. Idk, I need help.