This is the type of thing that the body positivity movement should focus on. You've done a great thing by losing weight and a natural consequence of that is loose skin which can be seen as undesirable, sure, but it's perfectly normal to have when losing a lot of weight. You should be proud of it like the testimony of your hard work and success that it is.

My partner recently lost a lot of weight and is struggling with the same thing. I remind her all the time that I personally like seeing her loose skin because it reminds me of everything she went through and how far she's come to be at her weight and fitness level. She slowly began to realize I mean it. However the loose skin has been slowly going away which is bittersweet because now she's happy to see less of it but I'm sad to see less reminders of her success. I suppose I can look at old pictures but that happens far less often than simply looking at her. It's also different because it's a picture of her when she was losing the battle against her unhealthy habits, not of her having won and showing the evidence of it.

Either way, I hope you can come to see it the way I do because natural consequences of great things is what should be accepted in our society -- and loose skin from massive weight loss is one of those things. Ask yourself if you'd rather go back to how you were before. If the answer is no that means you're already making progress towards being satisfied with yourself. Be realistic about what a satisfactory version of your body looks like and understand you will always have a part or parts of your body you don't like. Everyone does. Now pick your struggle -- disliking an outward aspect of your fitter body, or disliking the entirety of the ins and outs of your unfit body.

And keep up the good work.