Am i insane?

I don't feel emotion, I used to, but I had a major depressive episode several years back and now I don't. According to my psych teacher and book depression should only last 6 months to a year, blocking or twisting emotion during that time, but afterward relative normality should be restored. But that was 5 years ago and I still don't feel emotion, no sadness, no joy, no anger, nothing. I've been relying solely on my knowledge to incorporate emotional-like reactions to stimuli. My parents separated, I felt nothing. My best friend will no longer speak to me, I felt no remorse though I know fully that I was at fault for her distress. I can logically deduce things I never dreamed I could before I lost my feeling. I can now see an issue from nearly every angle, not through empathy, but through knowing psychological factors of general sub-groups and how they may effect the decision-making process. Everyone I know says they don't want to see me in any position of power for fear of their lives. I've been called the "smartest person [they've] ever known" so many times it is sickening. I don't care about human lives, honestly I think the race could use a 99.98% cut in population, but I know by law and by the standards of "The People" that such thoughts are unacceptable.