My [33/f] husband's [33/m] cousin's [34/m] wife [34/f] had twins the same day I had my son. Before pregnancy she was already me [same height] and now she has lost all the weight and had a tummy tuck. I haven't lost any weight and don't want to be around her because I'm so embarassed.

18 months ago I [33/f] gave birth to my son. My husband's [33/m] cousin's [34/m] wife [34/f] gave birth to twins on the same day. We are the same height. Before our pregnancies I weighed 220 lbs and she was about 100 lbs less than me and we are the same height. I have never been thin like her. I gained 80 pounds during my pregnancy. She only gained about 30 pounds and even though she had twins she was still half my weight the day we both gave birth.
When we were both pregnant and there was a BBQ at her place she had mentioned to my husband's aunt she was going to get a corset or binder to wear after she gave birth. I had been thinking about it too so I asked her about it. She told me where she was getting it from and we both ended up getting one. She wore hers home from the hospital and all time except for when she was sleeping or showering. I had to take mine off after 10 minutes because it was too tight. I exchanged it for the next size up and I still couldn't wear it. I went to a place near my house that sells shapewear and binders but even after getting measured by a professional everything was still too tight and uncomfortable.
She spent a year wearing the binder, going to the gym every other day (just like before she was pregnant) and eating healthy to lose the baby weight and get back into shape. 6 months ago she had surgery to remove the little flap of loose stomach skin she had because she couldn't work out to make it go away and she says they are done having kids. She also had a round of lasering done for the stretch marks.
So now her body is back to how it was pre-pregnancy and she is back to her pre-pregnancy weight. I am 320 pounds, 20 pounds more than the day I left the hospital with my son and 200 pounds more than she is now. I failed at going to the gym before I was pregnant. I signed up with the same trainer she works with sometimes twice but both times I did not stay committed. I failed at wearing the corset she wore. I asked her for meal advice and she gave me a few links and told me what stuff she likes to eat and I was hungry all the time and couldn't follow it. We could afford for me to have a tummy tuck but both doctors I talked to said I would have to lose half of my weight at least before they could do it. We are done having kids too but I am too big for it.
I know it's on me and no one else and I shouldn't make excuses for my laziness and lack of willpower. I don't know why I have no willpower but I know there is no one to blame but me. I have no reason for this. I had a good childhood, I have a loving husband, I have never had any abuse or trauma so I don't know why I can't lose this weight. I hated how I looked before but now at 320 pounds it is even worse. I went to two different therapists before but since I had no trauma to deal with and am well-adjusted except for my weight it didn't help. I always tell myself I'm going to commit to losing weight for real but it never happens. I used to have a lap band but I never lost any weight with it.
Next weekend another cousin is getting married. It is at a cottage and there is a lake where people will swim afterward and cousin's wife will be wearing a form fitted bridesmaid dress. I don't even want to be around her even though it has nothing to do with her. She has never done anything to me and is only ever kind to me. I am embarassed at how much I weigh. My husband doesn't say anything but I feel like I would be more attractive to him if I lost weight. I'm imagining everyone comparing me to her and how she had twins and is 200 pounds less than I am and looking like a bikini model just like before while I am a blob. I honestly don't even know how I can push this all aside and just enjoy the wedding. I know it's all me and this really doesn't have anything to do with her but I can't stop thinking about this.

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tl;dr: My husband's cousin's wife had twins the same day I had my son. I was 100 pounds more than her before we were pregnant and now I am 320 pounds while she is back to her pre-pregnancy weight of 120 pounds. Will see her at a wedding next weekend and I don't even want to be around her because I'm so embarassed about my weight and lack of willpower.


Source.

Of course she's small,she got a tummy tuck.

If you want the tummy tuck, do what the doctor says. Stop being dumb.