F-1 Visa and it's restrictions?

I'm basically getting a F-1 Visa because I'm attending college in the United States but I'm a Korean citizen. I know that the F-1 Visa is mainly for student use but if I have a girlfriend who lives in the States (different state from where I'm going to school) as a legal resident and citizen, does this mean I can't go see her directly from Korea because of the status of my Visa? Does this also mean I have to stay in school the entire time I'm in the United States? Would I have to first go to school then go see her?