Feeling no emotions is one of the worst emotions. Many times it is described as being dead on the inside. Without emotions, it is hard to tell if you are a person. Here are some sentences I heard people say.
I don't feel anything. I don't know if I'm alive.
I hurt myself because it makes me feel alive.
I'd rather feel pain than feel nothing at all.
Not feeling anything is so depressing.
When my younger brother died, I didn't feel anything. It was worse than feeling sad.
I've never seen that guy laugh or cry. He's so emotionless.