Not just the car, but buying stuff secondhand, yellow stickering, foraging, cooking from scratch, not having sky / netflix etc...
People do get so sniffy if you live within your means. So much is about appearances. But I'm content with how I live and don't give a flying flamingo about what other people think. Although currently, things I've been doing for years are considered trendy.
Happiness is curling up by the fire with a good book and a cat on my lap.
The peer pressure at school was horrendous though, as almost everyone in my year came from a far wealthier background than I - diplomats' daughters and footballers' daughters and the like. So it does give you a certain perspective.