What does it mean to dream that a ghost pinched my back? It doesn't make any sense. It's a nightmare to dream that a ghost is pinching your back. I often touch books about ghosts, or watch TV, play games, or read books. So I dreamed of ghosts in my sleep.
Don't take it seriously, you won't know anything in the past, so don't care. Or concentrate, concentrate on doing your own thing and study hard. Work hard. Live a good life, and such things will naturally be less.