Most people don't. Did you grow up in a third world country?
Most people in Alaska do. Also tons of my friends here in the Midwest do. Not rednecks either.
My buddy and me tag a deer every fall. We split the processing fee, and we each end up with 60lbs of fresh grass fed venison for roughly $1 per lb. yes....$1, per lb.
When I'm in Alaska, I'll go fish for an afternoon and can easily bring back 30 lbs of fresh wild Alaskan salmon, and all if costs is gas money to drive for a few hours.
I don't do it as much, but here in the Midwest you can go bank lining and snag some monster catfish. This costs virtually nothing and provides a freezer full of fresh fish.
Hunting/fishing for your meat and fish is a badass, fun way to put food on the table. Especially if you're a college kid on a budget.