Life in itself certainly can be something that is stressful as we exist in such an uncertain and unpredictable world where there is no limit as to how much we can suffer and where chance cruelly determines everything.
But rather than my existence always being stressful exactly I would see it as being tiring and very pointless, it certainly can be torture feeling trapped in this world. Existence is something that is always so useless and not worth enduring for me, it's horrific having the ability to suffer and it's awful how I exist here with no straightforward way to exit. Only death can bring me relief from the curse that is existing.