In the United States, there is a blanket of hopelessness spread across all of us and the perception that all is not well, and won't be well anytime soon.
It sounds like you might be depressed. Bills might be piling up, a relationship may be over, you could be lonely, you may feel sad. Talk to your doctor.
Hopelessness is often a symptom of clinical depression. In the depressed person, there is a chemical imbalance in the brain that cuts off good memories, leaving only the bad ones.