How are you today, cusack10?
I am sorry that things have been hard for you. I hope you can remember that everyone around you is not always right.
And yes, when one looks sad, people react to that. Sometimes they are concerned - they worry about you, since you look sad. It is horrible to be treated badly for being sad, though.
Try and do things that don't make you sad - like exercise, playing a game, drawing, or playing with pets.