I think that taking care of my family is not enough to fulfill me in life
Did any events in your past lead to the way you feel today?
Actually there was. My family is the reason why I was suffering so much in school.
It's bad that your family caused you problems in your earlier life, but you should not take your current family for granted now.  Appreciate everything that you have in life, and if you feel unfulfilled, you can try to find new interests as long as the people who depend on you are well taken care of.
I'm going to focus on making my family miserable.  I will torture them until they ask me to leave them.
It is wrong to want to harm your family, physically or mentally. They try their best and maybe you should sit down and talk about what is bothering you. That is the only way things are going to change is if you talk about it.