Just five years ago, I could not understand or conceive why anyone would just walk into a bar alone and drink for hours on end. Now I know...
I still haven't done it, but I understand the motivation now. They just want to escape, to block out the world... except it's not an escape, it's just an excuse to wallow in it. You don't have to be drunk, or sit in a bar to be loaded up with apathy, self loathing, and self pity, you can do it just fine on your couch in front of the TV with a stock of comfort food, while being productive and doing housework, walking the dog, or just lying sleeplessly in bed.
If you reach this point, you probably need help.
I think I'm going to get some help.