Try living without one. As a 38-year-old car free man, I feel almost deviant. In great shape from all that fresh and and exercise, but that also is somewhat peculiar (I don't look much like my age).
Or how wearying. I walked to work, and it took 45 minutes. I had to do that walk during 90 degree heat, 6 inches of snow the ground, heavy rainstorms etc, unless, like other people I knew without a car, we begged our coworkers for a ride. If we couldn't, we had to call out of work.
We have plenty of people in my small town who walk or moped to work because they are poor. They usually buy cars the first thing they can get, because walking sucks.
Honestly it's not bad, save for deep winter, which can be rough. Walking keeps me in shape, and it's saved me a ton of money in terms of monthly payments and insurance.