Humans punish themselves endlessly for not being what they believe they should be. They become very self-abusive, and they use other people to abuse themselves as well.
My life sucks: drugs. Life is awesome: drugs. I'm lonely: drugs. I'm with friends: drugs. I can't sleep: drugs. I need to wake up: drugs. I can't eat: drugs. I need to stop eating: drugs. My back/head/neck/arms/legs/body hurts: drugs. I have anxiety: drugs. Just because: drugs.