How to lose weight while breastfeeding?

Hello, I am a breastfeeding mom of a two old month baby. I have postpartum belly fat, and I am ashamed of my body. I just hate it when someone tells me I’m fat. I just don’t know what to do, I want to lose weight, but I’m also breastfeeding. Can anyone help me out with some tips to lose my belly fat? I’m stressed out; please help me.