Wow, you could be me, although mine is opposite. Come move near me!! :) I moved here from a smaller, but more urban city. I have had a lot of trouble making friends. Everyone has families or playgroups or local "friends" that are so hard to break into. People will be nice, but it never gets beyond the superficial, how are you doing, and they never invite you to be included with their "real" friends. Most are stay at home moms, and I work, so whenever I suggest anything, they always propose a time they know that I can't do, and everyone else jumps in, and they have a playdate while I work. No one is willing to meet in the evenings or weekends. A lot of these moms, I introduced to each other too, which makes it that much harder ego wise. So, 5.5 years after moving here, I still really don't have any friends here. My neighborhood kids are older, or the residents are older, and my church is across town, and hasn't been any more inviting.
The only thing that has worked for me is a playdate with one girl from my son's daycare. The mom is nice and we take them to the park, or once in a while to each other's house, but it seems to be more for the kids and our relationship is still superficial. I feel like everyone already has all the friends they need and no one wants to make the effort for another one.
Sorry, I really don't have help, just empathy. I will check back for better suggestions than my own. :)