Should studies or relationship come first?

Hello. My girlfriend and I have been dating for 8 months now and we just recently started college and both of us are 18. Our relationship is great and I believe I love her very much. She's helped be quit being self-destructive, abusing drugs, and get over my many problems such as anger issues. She's helped me a lot and I feel I owe a lot to her as she's also led me onto the track that school's important. I've also helped her in return where she's had a few boyfriends that treated her very poorly and I was the first one to ever treat her like a real person instead of just an object and also have helped her through some family and friend issues. She says she really loves me but considers school a higher priority whereas I consider her my first priority. Now I understand and have thought this through quite a bit but is this fair? I mean she was even considering dating other guys to "confirm her feelings" for me when she said that she still loved me and it seems that her words are hollow. I know school's important and all, but in my opinion, true love should be a priority. I mean I'm currently studying to become an investment banker while she is studying to become a teacher. I would easily miss a final for a cl or even drop my career plans entirely if she so desired. I don't believe this stems from immaturity but from my willingness and commitment to having a good relationship. After all, in my opinion love should be what makes someone happy, not a career or money. What I basically see from this is that her want to become a teacher is more important to her loving and being with me? I thought many other scenarios and such and it all just seems that I'm not that important to her and that I definitely care more about her than she cares about me. I've always taken care of her even if it means getting out of my way to do so whereas she seems only to be interested in me when it's convenient for her. Am I being unfair? I know that if I "really" loved her I'd support her in her goals, but it feels a little empty to hear her say she's loves me so much yet her goals are more important than me. I mean what if I said if my career was more important than her? Obviously I'm considering that I may not be with her forever and marry her as since I'm 18, there's plenty of fish in the sea and am still very young, but I'm posing this question to see if I'm being unreasonable or if it's grounds to maybe reconsider this relationship even though I love her a lot, I'm not so sure how long I can keep going if she doesn't love me back with the same devotion. Thanks for reading and sorry for such a long response.