Am I overreacting?

So this morning I get up and see what I can eat and I asked if I could have some cereal and my step mom said to me“I’m not trying to be a bitch but eat a yogurt please, you have been eating like shit all week, you had McDonald’s, tamales and rice pudding yesterday.” And she knows I’m always worrying about my weight and recently I’ve been feeling so good about how I look. I only weigh 130 and I’ve never thought of my self as pretty till the past month and now that she said what she said to me I cried so hard and now I feel ugly again. Should I be upset about this?