I hate to be the first downer in the thread... but college isn't the lonliest place.
Try after college, when you move away from all the close ties you've made, your girl of 2 years runs off with someone she met in Hawaii, and you are in a city you hate with nobody you know and a job that doesn't afford the luxury of building friendships.
I would go back to college so fast just for the chance to be in an environment that supports meeting people!!! Take advantage of it, please. It doesn't last forever and it can only get harder after you graduate.
I've said this in other threads too. Find your RA. Talk to him/her. If anything, they can point you towards groups or clubs that you might have an interest in. Plus, they can introduce you to people on your hall that you might not have met yet. When I was an RA I did that a lot. "Hey, you like <activity>? Mike in 234 likes <activity> too."
Also, try not to match your GF and drink it up too much. She drinks too much and she might be living at home next year...