I hate my breasts

I’ve always hated my breast, it felt like they went from barely fitting a B cup to a DD in just a few short months, which made them saggy. As my breast grew, so did my nipples, they’re about the size of my fists. They’ve gotten even bigger since I gave birth to my daughter 4 months ago. My fiancé tells me he loves my body, but sometimes I find that hard to believe. I’m so insecure, sometimes I stay up at night just crying because my breast are so ugly. I’m only 19, I weigh 132lbs so I don’t get why my breast are so saggy and my nipples are so big even before I had my baby. I hate my body so much it has triggered my depression throughout the years. I want to love my body, I’ve tried for years to accept my breast but it’s so hard and it just makes me feel very ugly and disgusting.