Some people experiencing what you describe have learned to pretend that things are better than they are. I think most of us would call it ‘putting on a face’. Like you did with the interviewer. We smile when we are having our picture taken even when we don’t feel like smiling. It’s the same thing only on a bigger scale. Big company people say ‘Fake it till you make it’. There’s also ‘Act as if..’. Act as if things are better than they are until they are. Work at that for a while and surprise surprise they are better. It is a fact that your life will be what you make it. And right now you are simply sitting back and letting life chuck whatever it wants in your direction.
The turning point for me was when I got so sick of it all I screamed “Enough is enough! I have suffered enough! I’m finished putting up with this sh**! I don’t care what happens anymore!” Then I stood back and waited for the sky to fall. It didn’t and things began to improve slowly but surely.
Good luck.