Having made my living online for the last ten or so years, I know exactly what you are writing about! I sometimes find myself in front of the boxes as much as 16 hrs a day, which is too much and inefficient like crazy. At such a point, I leave the house. I go play with my dogs, play with my cars, go for a drive, go to the bar or sometimes just go for a walk.
I also find that most people of similar age to myself have no idea what I mean when I say "I do internet marketing." and ask all sorts of silly questions, like "What do you sell?".
When I tell them that I don't sell anything, things deteriorate quickly and get even worse when I try to explain things like PPC, CPA, PPS, Affiliate Marketing, Adwords, etc to them.
I mean, these people can barely do email!
The consequence of this is that I have few friends my own age as we have little to talk about but the flip side is that I have many younger friends, including the girls.....................................................
That works out well for me, so I am pretty happy.