This is tricky. Your already challenging transition to college is complicated by very much missing a girlfriend who doesn’t have your freedoms because she is still in high school. Can you afford to visit home once a month? In between have Skype dates? And as @momofsenior1 asked, what are your girlfriend’s college plans? It would be a shame to lock yourself into leaving for two years only to have your girlfriend enroll in your current school and move there next fall if you are still together.
If you are destined to beat the odds and make it as a couple over the long haul (lifetime, death do us part is the best case scenario) and you both want careers, then you are going to have to make tough choices and be apart sometimes potentially. It’s not going to be easy, but if it’s for the greater good of your relationship and your future family life, it will be important to do and survive. That’s what couples do, make choices that benefit the couple as a unit, even if it doesn’t relieve the immediate pain of being apart.
You have to factor in your educational and career goals. If you are a couple forever, you also have to think about your girlfriend’s goals. It isn’t just about how you feel right now. You might get some immediate relief if you go home, but you have to figure out if that is best long term.