I was forced to that conclusion a couple years ago. Even on regular antidepressants I find myself slipping away when things get tough. Although I haven't gone off my meds, a month ago some people I was very close to and thought I could trust betrayed me and have been avoiding me ever since. Since then it's hard not to get the feeling that everything is fucking pointless and not going to get any better. Life just isn't worth living when you're all alone, no matter how many guitars you have.