You create most of your own misery.
Through your thoughts and feelings, you develop and then run simulations, which become anxiety-producing ruminations on possible harms. However, “survival” (which is why we undertake misery-making destructive behavior) is about ensuring the next step, not the fourth or fifth possibility.
Staying present deflates enduring into being.
(Staying present means rejecting the past harms from shaping your present reaction while not projecting into the future possible worries.)
While this may not appear as thriving, it actively rejects self-harm until a moment when an opportunity opens from which you can succeed.