OP, thanks for starting this thread and I really appreciate all the comments I grew up very similar to many of the posters here, but feel like I rarely, if ever, meet someone from a similar background. I can easily say that I only have one friend and two colleagues with similar life experiences.
This area really does warp perspectives and the escalating income inequality over the last 25-30 years doesn't help. Whenever we feel pinched now, all I need to remember is my parents cutting out the front of of my tennis shoes as they were too small, but they couldn't afford a a new pair. My husband grew up in an upper middle class family but he is quite thrifty and not given to indulgences. Some of our DCs' friends have the latest of everything. I know our kids envy their friends' toys, but we stick to our guns about what they can get and when. While they may never have that sensation of absolute elation of getting an ice cream cone at Baskin Robbins because your parents caught a break on some bills, they can be fairly grateful (not always

with gifts and unexpected treats.
My oldest is pretty gritty. While he is not driven by the same fear as I had as a kid, he likes to do well in school and never needs to be reminded about homework, etc. Our youngest is very smart, but not driven in the least. I wonder if he would behave differently if he was growing up in circumstances similiar to mine.
Again, great thread.