Do you realize how impossible it is to earn salvation? Like, it really is impossible. I ought to know. I've tried to earn it myself (and still, though I'm working on it, find myself falling into that mindset somewhat often).
My life became consumed with feelings that I wasn't good enough, feelings that even the smallest sin would damn me to hell with no hope of redemption. During the day, I would focus my mind on schoolwork. During the afternoon, I would focus my mind on things like chores and reading and hanging out with friends. During the evening, I would focus my mind on family time and Facebook. Sure, throughout the day, the feelings of condemnation would linger in the back of my mind, but I had things to think about, so it wasn't exactly horrible.
But when I lay in bed, with nothing to focus my mind on...that was when the bad feelings intensified.