Why is pain so traumatic & how to let it go ?

Why is it so hard to let pain go ?

It seems like pain is the strongest emotion to go against.. I can remember pain without a problem but any other emotion and I’ll have to think on it. I’ve tried so hard to beat depression to fight sadness but it always comes back full circle and tougher than the last time. I’m at a lost and I just don’t see the point of all this anymore... Do I need a different view of life other than my own ?