Or maybe you lived in an environment where some of those expenses were socialized via a broad social net - or you have connections via friends and family that you've underestimated the value of (a friend with a truck is cheaper to buy lunch for than renting movers). If I had reliable access to food shelter transportation and information at negligible costs (assuming ~$800/month constitutes low cost rent), I can totally imagine living within a budget of $15k/year (covering pounds to USD).
However, I used to live in Phoenix but moved due to the rental crisis. Simple clean 1 bedroom apartments are going for $1600/month, which blows your budget in rent alone. (The lowest rate I could find was $750/month, but you had to be officially poor ("restricted income") to qualify).
But before I condemn you in assumptions, maybe I'm wrong - would you be willing to break down your living expenses for those who would follow in your path?