This really depend on where you live. If you live in a reasonably sized city in Europe or Asia, a car is more of a hinderance than a help—as you write. At the moment I’m in Lisbon, Portugal, and owning a car here would not add any value to my life, and I would not seriously consider it unless I had a dedicated parking space (which is very rare in the city).
Mostly you can just walk , take public transportation (bus , metro , train , tram , ferry ), Uber , Taxify or eCooltra (by the minute electrical scooter rental) to anywhere in the city for about €1-5. If you need to go further, you can rent a car for about €10 per day. With all these options available with a tap, a car is really not needed.
Anyway, back to the topic…
Personally, I didn’t find it too hard to give up anything. After moving countries a handful times and doing some backpacking in my early 20s, I realized how little I actually needed to be happy. In fact, less turned out to be more.
If I am to name one thing however, it’s probably a nice stereo & home cinema system . But I find that a set of good headphones and occasionally going to the local IMAX theatre more than covers those needs.