cold winter water

I believe this is first truth in the universe that life is suffering, but why everybody doesn't want give up? Buddha listed a set of things such as living with unpleasure, separating with pleasure. When one try to commit suicide in the winter, he or she may fear the water in the river is too cold to step in. If this life is disappionting, why most people have desire for next life. Do they really believe the next coming should be perfect? I don't think so. Wherever you move, whenever you are, something never change.