My cousin have a inferiority complex that she don't get anything as her sister.but the reality is she herself couldn't state what is her problem exactly.because of this she thinks the reason behind every problem in life is she only (she thinks incapable of solving her small problems).so she feels depression and cries lot and have a suicidal thought. even if me or her sister tries to recover her by encouraging speech she is not ready to accept anything whenever the topic related this.