How hard is it to get back into the swing of school after the marine corps?

I think it's better to be with the FBI dude. being a US marine will get you to places a tourist would least likely visit I just don't understand your meaning of adventure of going to places where you can get killed by illiterate arabs with IEDs and 7.62x39s. Don't worry too much about the social life in college dude there is a wide variety of people there hero most of whom will be very interested in meeting someone like you.