I've pumped enough self-doubt in my mind and now I'm impervious to any personal emotion.
What are you trying to acheive?
I've been told frequently through my life that doubt is a sign of an intelligent person.
You seem to be prepping for the worst at all times. That's wise if you ask me, but don't get so caught up that it drags you down.
I'm not being a pessimist, self doubt makes me a cool person.
It's alright if you want to deal with your emotions in that way. As long as it makes you feel like a cool person it's reasonable.