On occasions, one feels very sorry for oneself and begins the process of self-pity. It is situations like this when one needs to stop and take a step back. Each time, self-pity is revealed in hindsight to have been a foolish decision.
Having a victim mentality leads to one releasing control of what can be changed within oneself. Of course, one cannot change things externally. For example, if a person is hit by a car, he cannot change that fact. However, if he survives, he can control what he can, namely his mental state and physical health, and possibly recover and live a good life.
Getting lost in a sea of self-pity is always a bad idea.