I have never written into an advice column, but have always wanted to. I hope you respond!
I think it’s important to separate your “wants” from your “needs”. Living this way and growing up in an urban area (Chicago), I never owned a car. Instead, I borrowed cars from friends or rode my bicycle. I have since moved to New Orleans, another urban center, but one with worse public transportation and access to grocery stores. Other things have changed in my life: I went from scraping by somewhere below the poverty line to making money somewhat above the poverty line.