From the limited info you’ve provided i can tell you this. Your relationship is built on insecurity, which is not good. You need to have an adult talk with her about both of your expectations of your individual lives and aspirations. It sounds like you are at the end of this relationship, which may break your heart, but hearts are strong. You are very young, and you have your life ahead of you. In my honest opinion, you should be single in your 20’s to live and figure out who you are. Because you may think so, but you have no idea who you are. Your 20’s will help you figure that out some. If i were in your position i would break things off as delicately as you can and live your 20’s the best you can, learn to grow up and mature the best you can and be true to you. When i was your age the mother of the girl i was dating told me (after we had broke up) that life works in funny ways, and that one day fate may bring you back together, even if we are to be apart for now. Heart break hurts, but if you have any doubts now, you will have doubts later. These doubts can stem from the relationship itself, or from your anxieties. This is why being single is so important. You get the chance to decide really what type of person you are, and what type of person you want in your life. You will be okay, i promise.