My sister is so shameless

You are too concerned about your "fatness", so no matter who calls you fat, you will be very sensitive and disgusted. This is your psychology at work.

Your sister is the person closest to you and also a member of your family. When he talks about you, I don’t think he means to laugh at you. It is more of an expression of family affection. And you don't understand.

Actually, the solution is very simple. You just need to smile. Instead of keeping it in your heart and worrying about it, it is better to be happy and humorous: "Am I fat? Am I fat again?" That means our family’s living standard is getting higher and higher.”