There's a famous quote: "I've been fat and I've been thin. Thin is better".
I've forgotten who said that, but I remembered the quote, cause it's funny but oh so true. In my life experience, being thin is life-altering. It makes almost everything in my life better. I love fashion, so yes, shopping is infinitely better. The prospect of dating is less daunting when my weight is not the main hindrance. Looking at my naked body in a changing room and not cringing...that's pretty amazing for me.
So yes, it's vanity, but there's no denying that not being overweight is affecting my life in all aspects positively.
It's also the pride you gain in yourself from doing something that is extremely difficult (for most people). Losing weight and exercising hard and consistently is very hard for me. I am by nature lazy and have an unusually large appetite. I have overcome these hurdles every day! So darn right I'm proud!!!
Being thinner is fun! I recommend everyone try it, lol!