Snap back fail

Ok. I'm feeling a bit jealous and sad about this. My pregnancy is good my issue is the post partum and how I heal. Okay so me and my sister has 2 kids. I'm the oldest by 2 yrs. I'm 5 ft 2 and she 5 ft 4. Im a size 6 and she a size 5. Diets are the same. So this is the issue, I never got my stomach back after baby #1. I had a c section with my daughter. But then my sister gets pregnant and has her baby and she snaps back! She had hers vaginally. Okay. So then I have baby number #2 another c section and my stomach is worse and so ugly. I have this flab and my naval is out and won't go in. But my sister has her baby and this was a c section and snaps back! Has me feeling sometime of way. We both work out together and In shape. I ended up going to my doctor and he told that my babies stretched me out in the abdominal area and they never dropped so it's why I had the c sections. He suggested a Tummy tuck of the abdominal damage. When he said that, I feel fat now. My husband assures me that I'm not fat. Just have a tummy problem that happens when I had our kids and he okay. But I'm not. I'm like really self conscious about my body now. Especially when she can wear a 2 piece and then I gotta wear this old lady one piece. Tummy tuck is expensive. But I'm kinda considering. To feel better about me. But any comments about this tho.