From my experiences, people change a lot after high school, and then they change a lot after college. I would say don't waste your first year or two trying to make things work with a high school girlfriend that you won't even see anymore. You'll be missing out on too many opportunities to meet other people that are going through the same experiences as you at your own university.
If you find someone in college, there's still that big chance that you won't end up together. You two might want different things after college, and want to move to different things, or want to live your lives differently and spend your money on different things.
The version of you at 17-ish years old won't be the same as you at 24 years of age. What's probably best is you and your girlfriend break up, and maybe you two can stay in tough, and maybe after college you two will both be single and randomly see each other again living in the same area and you two can start dating again, that time with greater potential to be together the rest of your lives.
This happened to my sister and her now husband. Dated in high school, went to different colleges and went their separate ways, but still liked each other enough to get back together after college when they found themselves in similar places in life to where they could be together, and then got married later.