Although on paper the earnings in developed countries may seem very high, the structural and unavoidable costs of living may make it difficult to get by.
I've experienced this myself - I moved from an Eastern European country where I had a regular comfy software engineering job to Belgium and financially-wise I'm way worse. On paper I earn than I did back home, but high rent, living costs, various fees and exorbitant taxes eat up most of what I earn. I am able to save much less that I was able to save back home (both relatively and in absolute monetary terms).
In case someone asks: I have moved to pursue a way more interesting job than I could find at home. Money was not a priority for me and I don't complain - I wrote this just to explain how sometimes you can be better off financially living in a less developed country.
Your example actually confirms that - I don't think many people anywhere in the developed world would be able to build up a lifetime of savings in just 7 years of working, even if living very frugally (which you claim not to do). Aren't you getting very well paid relative to local standards?