I'm okay , thanks for asking .

I wish I didn't have to explain because I know that even if I tried , people won't understand. when someone asks me , " why you look so sad ? " or even " how are you ?" , do they really mean it ? I mean , do they really want to know ? or they are just asking out of social manners that obliges them to .
I hate the question

How are you ?

because the expected answer is always the same and those who ask don't really care much if you changed the answer ...