stop using food to comfort myself

well I’m in the process of becoming healthy, and i find it really easy to do. I just know that if i eat that doughnut, or litre of ice cream, I’ll just feel bad about myself after. So that’s easy enough. Then, I’ll have like a really bad day, or morning and my mom will just totally chop up every piece of self esteem i have, and then I’ll have to go to school. As if right? So instead of crying I’ll just stuff my face with a bagel or something, and then its easier to feel normal. There isn’t even a thought process, its just eat whatever i can find. I’m not sure how to fix it, I mean i’m already so conscious of my eating habits.