I can see where it's culturally popular to equate 'going out' and 'being out and social' with the bar/club scene, but that's a media image more than a real one. There are a lot of ways to go out and be out and meet people without doing that. Do good works, volunteer, hike, bike, join groups, do meetings (and there are piles and piles and piles of meetings in this day and age, and considering how many people want me to go to one I only have to assume that there is a lot of room at these meetings) hang out at bookstores and libraries, or coffee houses.
And come on, working the night shift (yes, I have) gives you no more, or less time than any other shift. You just have to learn to rearrange it, and sometimes it turns out to be even better.