I am very introverted, I seldom communicate with my family or outsiders, and sometimes I don't talk for a week. What should I do if I am often looked down upon?

You are so introverted that even your family didn't talk much for a week. This is obviously not normal. You should change this situation, at least go out and have a look. There must be a place for you and the people and things you like. If you stay at home and don't talk to people, you must be slim. Now you can only integrate yourself into society and communicate with others. Then you will have different ideas and be happy from now on.