Is it normal to eat your blackheads and scalp scabs?

I love to run my nails through my hair along my scalp repeatedly and eat the dead skin that under my nails accumulate.
Its best when I find a scab or extra dry skin to pick off and eat. I love the chewy texture. When I was around 8 I would sprinkle salt into my hair so I would have something to scrape out and eat.
I'll also squeeze my blackheads and occasionally pop a core into my mouth to chew on.

I know these are both very gross habits and no one in my family knows that I do it, but I am wondering does ANYONE else do it? Its it normal to want to eat things off your body?