@loveyouradvice As others have said, you need to look forward BUT also learn from the past.
In terms of damage done, the weight will have impacted (literally) on your joints and you may have wear and tear in your knees and hips and possibly need replacements at some time. If you feel joint pain, take notice and get X rays to see what's going on.
Being overweight increases inflammation in the body which adds to the risk of blocked arteries and also cancer. The fat evidently stops the body processing inflammatory changes- this is why Covid affects overweight people more and their lungs can't cope because they are not working efficiently.
You are also at a higher risk of all cancers - especially bowel and female cancers - but losing weight now is a huge benefit so don't assume it's all too late.
I think you need to stop thinking about being on a diet and adopting a healthier way of eating long term.
I'm over 60 and the only way I can stay slim is by eating very few carbs, making sure the ones I do eat are wholegrain and I don't drink (that's for a medical reason; allergic to alcohol.)
I work on the 80:20 principle. For most of the time I don't eat cake, biscuits, crisps, pasta, white rice, white bread, very little potato, sweets and anything with sugar.
I eat loads of eggs, fish, chicken, green veg, cheese, plain full fat yoghurt, fruit etc, lentils and other pulses.
My normal day is usually eggs or porridge or plain yoghurt, with fruit, homemade soup for lunch or a salad with protein, and dinner is anything from a homemade shepherds pie, stir fry, salmon, white fish, roast chicken, etc. I try to get 5-7 fruit/ veg a day.
At a weekend or whatever I'll have a small portion of a pudding as a treat. And 1 square dark choc a day :)