Sounds similar.My mom always had problem with my eating.No disrespect but she was flat chested,I started developing very curvy and attractive body around your age and she started telling me I will be fat one day.She showed me one of an obese aunt and started body shaming me that soon I will be looking like her and no body will like me when I grow up.But my classmates told me I had a good physique. DONOT INTERNALIZE WHAT SHE IS TELLING YOU.Eat well and exercise. She is body shaming you just like my mom did.This age is important to you.your body needs good nourishment.god bless you my dear.