I have to agree with Kilgore and Sprinkles. Saving oneself is pretty pointless without saving others as well.
Not entirely.
Although they aren't as great, imaginary friends would be there for socializing, or perhaps you could find a surviving, tame animal to spend time with, maybe multiple.
Entertainment, which I see as a sole reason for us to live (for the greater majority of us), is endless now, scoping out movies, books, music, etc. for free now. While electricity will not be in existence anymore, generated power works just as well. There are more things to shoot for people into that sport, or for people who like to role play, it's very possible (especially if you decide what your imaginary friends do in part of this). Pyromaniacs have endless things to burn, perverts a lot of free porn, food junkies have grocery store amounts of food, druggies have thousands of chemicals to steal from hospitals or can find or farm a psychedelic plant in their own front yard, etc.
We are indeed social animals, it's almost a necessity for us to have real friends, but it is in fact not a full necessity more like an addiction. Many people may be driven mad by this, but what does it matter after the apocalypse? Preventing yourself from losing it entirely can be highly encouraged by psychology or philosophy which will not surround you as much as other things, but it's still out there, not only is it out there, it's in you.