I'm going to buck the trend a bit, sorry. I went from 92kg to 62kg over around 2-3 years and am currently sitting at 65kg.
My life hasn't changed since I lost weight, except for the fact that I wear different clothes.
I am neither happier nor sadder, I haven't really noticed a change in the mirror (I never thought I looked particularly large with a BMI of 35+, I don't think I look particularly slim now with a BMI of 25), my personality hasn't altered at all. I don't feel any more confident than I did when I was larger, and if I put on the odd few kilos over Christmas (as I have), I don't feel any less confident. I don't feel healthier at a lighter weight, I did a lot of exercise when I was heavier and I do the same amount now.
The only major change was developing gallstones (from weight loss) and having to have my gall bladder out just before Christmas.
I realise this doesn't give anyone any motivation - but honestly my weight didn't define who I was or how I felt about myself and it still doesn't. I am still who I was at 92kg, just in size 10 trousers instead of 18. I lost the weight because I felt it wasn't healthy to be morbidly obese, but not for any other reason.