My wife and I have been married 46 years. We dated while attending different colleges that were abot 150 miles apart. We would travel back and forth to see each other probably two out of three weekends. My grades suffered a lot as did other relationships on campus. However, we were seriously in love so at that time I would not have had it any other way. We got married at 22. In your case, coming out of high school, you will be faced with the fact that she will suddenly be thrust into a lot of other social situations, meeting other guys, etc. All I can say is good luck. If you are able to sustain the relationship, you will be doing good. There will be a lot of challenges.