How can someone control their food intake?

This morning, when I was having breakfast, my mom asked,Where is my food?I was confused and asked, 'What are you talking about? ,She then said,this food was meant for both of us, but you ate everything.

"I told my mom, 'I already told you to cook more food.'

She replied, 'Yes, that's why I cooked more, but you ate it all. I didn't know what to do, so I just washed my hands and plate and my mom said this ,If you get married and go to your mother-in-law's house, please don't eat like this,while mocking me.

I don't even realize that I eat more food than others. Sometimes my sister and even my friends point it out to me. I'm not obese,I'm fit,but once I start eating, I can't control my food intake.

So please help me,how can I control this? Or should I just eat the way I want without worrying about others or should I ask my mom to cook more food?