Everyone's physique is different. Some people have thin breasts, while others have thin faces first, which varies from person to person. But it is undeniable that since you are thin, you must be thin all over, not locally. It's just a matter of visual appearance, and the obvious thinness of body parts is different. This is a normal phenomenon.
To lose weight, it is actually recommended to eat seven points and practice three points. If diet and exercise are combined, it will be easier to adhere to and achieve results.
Wish you success!