I feel ya. That was me in college. Classes, library, sports, work, friends, partying...got to be too much.
I did vote, thanks mainly to friends who were involved and made it effortless. They took me to register locally (they were going anyway so I tagged along) and then took me to vote.
Voting always made me feel good, which is (I guess) why I've kept doing it every election since. But like anything else, it's hard to schedule.