Watching movies with friends, they all cried, I didn't cry, and then they said I was heartless. Am I really inhuman?

Not crying doesn't mean you have a heart of stone, because everyone has a different understanding of the movies you watch. Maybe some of the plots in the movie are similar to your own experience. When I think of myself, I can't help feeling the same way, feeling sad, feeling uncontrollable, and crying. For you, you may feel that you are telling other people's stories, so you don't feel much, and your emotions can be controlled.