I'm also at MCW, and if the OP wants to send me a PM, I'd be okay with that. I agree with a lot of the previous posters - if you don't have a group of friends by now, you're going to have a hard time making lots of friends. You can change that, but it's not as easy as it was when school started. You can always go to more social functions that are open invitation, and hope that people will invite you to their events as well. At least in my class, there are always notices going out on Facebook for different birthday parties or whatever. If I wanted a more active social calendar with my classmates, I could certainly do that.
Some parts of Milwaukee definitely suck, but I don't really think there is much that you can't do here. There are museums, festivals, concerts, fairs, sporting events, lots of volunteer opportunities, a baseball team that actually had a winning record, and more bars than you can shake a stick at. 😛 If you go to church (or would like to), then that's one good place to meet people with similar interests that aren't in med school. My wife and I are part of a small group with other married couples from our church, and that's always fun.
I'm sorry you don't like it here. 😳 Maybe you can turn that around.