I had this problem 4 years ago. I joined a fraternity. It was awesome. Was it juvenile sometimes? Yes. Was it one of the best decisions I've ever made? Yes. It greatly widened my social circle and introduced me to people I'd never have met otherwise. Plus, I met my soon to be wife from a function there. I never would have met her slogging through engineering.

Also, I've been in the work force about a year and a half, and I think the social skills I learned were probably more important in the long run than the technical ones.