See, in spite of my not listening to Nevermind in years, I can still recall, vividly, the songs from it. The "yeah yeah yeah"s from "Lithium," the chorus of "Territorial Pissings," the first time I heard "Polly" and thought it was just so creepy and cool, etc.
All that is still a part of me, almost as if it were in my genes. That album blew my 12-year-old mind; I hadn't heard anything quite like it before. As such, my formative years were spent playing that tape over and over again to the point where I had to get a second copy simply from wearing down the first. That thing—that memory—is something I don't want to relive. Let it stay in the past.
The main reason, incidentally, for my not listening to it for so long was due to a brief period in my late teens where I rejected everything that was popular, that the masses at large held dear. When I grew out of that awful phase, I never tried to get into Nirvana again for the aforementioned reason.