I want to lose weight 😏

I'm 20 years old... currently I weigh between 265 - 258 ... It's jumps up and down.. I've cut down on soda, sweets, and fast food. I've tried Herbalife but I just felt so hungry when I did it. I do go walking sometimes...lately I've just been giving up, eating one meal a day..I just want to lose some weight...what should I do?