My girlfriend and my mother believe in eight characters, and they liked me very much, but they didn't agree with us because of the disagreement of eight characters!

According to what you said, it's not a matter of eight characters at all, but you are both too young. Parents will think that you are eighteen or nineteen years old and have no rational judgment. It's really immature to talk about friends arguing with parents without going to college. If you really have a good relationship, you should treat it coldly, the exam, the job. When you all have ideal schools or jobs. Parents saw that you all have the potential for development and progress, and naturally accepted the choice.