"Our little sins don't qualify as evil."  Jesus Christ taught the little virtues were big righteousness.  Doing it to the least of these His brethren is doing it unto Him.  And He also taught the Big Evil is conceived in the sinful heart as little evil first.  Lusting in your heart after a women is committing adultery and it shocked His disciples to hear that teaching.  Being angry with your brother and hating him is the sin of Cain, murder is just the fruiting body of  the sin.

Thinking about my sinfulness this way is mentally and emotionally healthy. If we were talking diets, you'd say I was anorexic.  But everyone would look at me and say to you, "he can't be anorexic, look at him."  He needs to shrink, he doesn't need to see a shrink.

Guilt is good - for the guilty - it is the correct perspective; call it good guilt.  The way most people deal with neurotic guilt is denial - denial is never good for mental health.