Why do i have compulsive or rather obsessive thoughts of dying whenever i felt something bad is gonna happen?

its a common symptom of a lack of self confidence. You feel like if you dont do something perfect, you are neglected by everyone. I know how you feel. but your not alone! Taking your life is not even close to reasonable solutions.. Heres and idea for you, Take the scenario that you feel like you are rejected or failed and think about the best outcome. Then think about the worst (in this case, killing yourself). Now In your head, "re-do" the scene and try to make yourself feel like you did it right. THis will put an image in your head of what you did right. We only have one try on earth and it should be ended naturally, Not by yourself or someone else. Dont listen to people that say you need to go see someone or get help, But you can do this by your self.