I asked my mom how can i lose weight

I live in a pretty weird family. I mean, I am a bit overwhelmed by my family because those people are maniacs. My family has always been all about food. Therefore, everyone in my family is obese, including me. I do not want to be obese. As a matter of fact, I plan to shrink my size because I no longer want to live this kind of life. However, it will be extremely difficult to do so having those people around. I am twenty-two years old and I cannot move out from this place just yet. I do not earn a lot and thus, I will not be able to buy my own food. I have to eat what my mom cooks and she cooks very well, I have to agree. However, everything she cooks is either extremely sweet or salty. She never economizes on salt and sugar. Nor does she economize on fat. Thus, those dishes she prepares may be extremely tasty, but they are extremely rich in fat and other not very healthy substances. I asked my mom how can i lose weight and she started laughing at me. She said that I look perfect. I know that I do not. I need to know how can i lose weight but I will certainly not get any reinforcement and feedback from my family. I am all by myself. I would love to change their mindsets, they are sick...