Ahhhh I'm going to crack what should I do?

First of all, you do need to clean up after yourself. The parents and grandparents work, they should not have to come home and do dishes. When she asks you to do something, you need to do it. A headache should not have stopped you from doing the dishes. I agree, they don't understand that these days, things are different, and more things to do at home, as opposed to going out anymore, too expensive. Your grandmother has developed this attitude toward you, because you do not respect her. You should not, nor have the right to question her about something she did not do. Don't worry about what your cousin is doing, do you. You need to find a hobby, or figure out what you want to be when you grow up, cause sweetie, life is too short for all this. Less mouth, more ears. Sorry, but this is my answer.