I am from so called 1st world, how do you define “shitty country”, are there better ones?

Yes and it's really easy.

Are the vast majority happy? = Good one

If not = Shitty

Example? Norway[1] = good, Sudan[2] = really..really shitty

[1] https://www.bi.no/en/research/business-review/articles/2025/...

[2] https://interactive.aljazeera.com/aje/2025/sudan-voices/

To be honest, those two are so far apart it's not even comparable.