You get to a state of needing the drug to be human. You can interact with humans, work, take care of your kids, do homework, play games
, wash the dog, make dinner, pay bills, and live like anyone else, but you need that drug to function....to be "normal".
Drugs change everything about who you are....who you once were. They change you into a completely different animal. For example, my agoraphobia, which I never had in my life before detox, got really bad when I was on Heroin.