I genuinely never feel stressed. I'm not even sure if i know what it really feels like. I don't feel any pressure to do anything unless i deem it necessary. Job interviews feel like the employer is being evaluated by me and not the other way around. Most of the time i have this deadpan facial expression. I never feel envious either, but that's about it, otherwise i'm a normal person with normal feelings. So, is there a scientific explanation for being like this?