acdub - I am from a very, ah, overweight part of the country, but have felt like that, too. Not just in big cities, but at concerts and festivals and protests and, heh, college as well. I wish I had good answers for you, but I am sure that on some level I let my weight defeat me and retreated from the world quite a bit.
You don't have to do that. You shouldn't do that! I think the best way to stay engaged and active is to stay engaged and active, and that can also keep you from giving up and gaining the way I did.
Congrats on your losses thus far! The previously-too-small pants thing is awesome.