In fact, your heart has already made a decision, but you just lack courage.
If you really decide to let go, then I advise you to let go quickly, which is good for both sides.
Judging from your description, your girlfriend doesn't really know you, in other words, you are not suitable. You are from two different worlds now, and it seems that it is difficult to get closer to your.
Talk to her sometime and say that you are tired and don't want to continue.
In fact, this is a very simple thing.
You just go to college now, even if you haven't broken up yet, what about after college?
What I want to say is that there is still a long way to go, and you have to meet many people, among whom there must be someone suitable for you.
If you really meet such a person, hold her tightly again.
Remember, don't wait too long. If we don't stop, there will be chaos.
I hope you can find your own happiness, come on!