For some reason I've always been pathologically afraid of debt of any kind. It took me a big effort to apply for my first credit card back in 1996. When I got it, I used to send a check for $200 to the credit card with zero balance before cautiously charging it for gas and little other necessities while making sure I didn't exceed the $200.
I chose college based almost exclusively on the amount of tuition that I could pay for with the help of government grants and part-time work.
My first house was a decrepit foreclosure that could not be mortgaged because it was in a really sorry shape including fire damage. The price, however, was low enough for me to buy it all-cash shortly after I graduated from college. Just the cost of materials to fix it was comparable to the price I paid for it. I had to deal with squatters, druggies and other unsavory characters. On my first day as a proud homeowner I filled a full container of disgusting trash including feces, needles and shell casings. Lots of sweat equity, but I never went into debt for even $1.
Now, a decade later, I'm still debt-free. I have a nice house in a beach area, a vacation home, several rental properties, and many other assets. All were bought cash-only. Granted, a big part of it was matching my Aspie talent with a very lucrative carrier, but, probably just as important, I never paid a dime of interest to anybody.