You know what provides that atmosphere? New York. Or SF. Or Boston, Seattle, Austin--pretty much any city. I did not miss out on those opportunities from dropping out. The difference was that I was in the real world that colleges theoretically prepare you for: no RAs, no meal plans, fewer second chances, etc. I don't know why a fake version of the real world is a better preparation for the real world that the real real world.
There was one other difference: not going to school is far, far cheaper. And you have enough free time to defray even that minimal cost by working.