No. Everyone does not pay interest on common purchases.
There is much more access to credit in the US, most Americans use that credit a moderate amount to smooth cash flow for bumpy purchasing.
It is certainly the case that there are outliers who overuse credit, and many people who abhor credit like it sounds like you do.
One of the biggest differences between US borrowing and the rest of the world is that bankruptcy is very very easy to access, has very little stigma, and clears out most debts.
This makes the perceived costs of carrying a large debt load quite different.