over the years I've spent most of my time on a MTB of some flavor, in some cases I've turned them into nice pavement bikes with narrower smooth tires and bars that gave me a reasonable aero position (considering i'm an uber clyde).

the FIRST thing I notice ever time I get on road bike again and start riding is ​DAMN THIS THING IS FAST doesn't matter if it was an 18lb road bike or my near 25lb old trek that I built up with a triple and 32c tires... it was so much faster than the skinny tire 29er I had been riding and once I got things setup for me it was also much more comfortable

if you can stash one in your dorm room a road bike would be a nice addition for the weekends and such, I don't know where you are but watch CL and there are real nice bike deals to be had... but fit is so important on a road bike so it's easy to get carried away on a good deal... DON'T... wait for that bike that fits you correctly