Stress, anger, pride and suicide

Suicide is a great sin. Suicide means killing by himself or herself. It is a process by which he or she takes back of his or her soul by suppressing and oppressing his or her own body. Why occurs suicide?? Why do people kill themselves for a trifling matter?? They do it at the time they cannot control their emotions or feelings or for stress and or anything. I don’t know why people choose to commit suicide. But when a person is cheated any place, he or she choose to commit suicide, I think.