When I got my first apartment, I had no idea how to cook for one or two people. That single potato just looked so alone, when I was used to peeling 20 at a time.
This sounds a lot like me - I was so used to cooking enough to feed six people that when I lived alone I struggled for a while, until I discovered the delights of entertaining and began to invite friends over every couple of nights.
My friends were mostly late teen-early twenties guys, usually offered to pitch in some cash (we were all students at the time) if it meant they didn't have to cook, and they took care of the problem of leftovers.
My favourite method, when I was living alone, was to organise Spaghetti Night with the guys - assign two to pick up the meat, one to find the tomatoes, another to forage for vegetables. All I had to supply was the pasta and the massive cooking pot and serving bowls and I got a good meal and company for the evening - plus they usually supplied the beer, too!