" the inexhaustible willpower to fight back every time you are lost in the abyss of all possible existential threats"
If not then you are CLINICALLY DEPRESSED.
You are STRESSED when
"You are mentally torn into pieces, loathing everything in the world and still love yourself. you know you can resurface anytime. All you need is spend some hours, maybe days in solitude, talking to yourself, reassessing and coming back with a better plan."