In the United States, unless you are physically or mentally disabled it's pretty difficult to be poor.
To me, being poor means not being able to afford basic things like food, clothing, and shelter. When I was growing up, my mom and I ate a lot of beans, soup, chipped beef on toast, etc. because it was hard to afford food. I never once ate one of the paid lunches at school. Not once. 13 years (K through 12) not once did I have a hot lunch. Always brought my sandwich.
For the first several grades, my mom made my clothes. My pictures from when I was a kid are kind of funny looking as a result.
I didn't have a school bag until 5th grade but rather had a bag my mom made from jeans. I did have a Star Wars lunchbox (which I wish I still had).
We didn't take vacations except I did go once per year to see my dad for a few weeks in the summer. We didn't have cable. We didn't have a VCR. And for quite awhile we had a black and white TV (and this was in the 80s btw, not ancient history) which I'm not sure where we got.
I grew up with the same furniture until I left for college that my mom had gotten years before (I have some of it here in our house, not antique stuff, just regular old furniture).
My mom raised me working minimum wage but slowly made her way up until saved her way and was able to buy a nice home for us.
I'd call that pretty poor by American standards. But we never thought of ourselves as "poor". But by Wisefawn's linked definition, we most certainly would have been classified as poor. My mom did qualify for all kinds of goverment assistance and it would have increased our standard of living some but refused it.
I should also mention that my mom has MS (Multiple Sclerosis) which has left her largely paralysed at times when I was growing up.
So if I come across as not being terribly understanding of people who cry poverty, perhaps this gives you a picture why. If my mom could make it despite everythign going against her, anyone can. Just a high school degree and determination and she today lives a pretty comfortable middle class lifestyle. Most of the people I grew up around, by contrast, especially when we were really at the bottom, I suspect are still at the bottom because they refused to help themselves. They just wanted to sit back and pump out babies and complain about how unfair life was.