OK, in Serbia that makes sense. Apparently the average wage is 11,570 $ (15,016 $ gross) vs ~$80k in the US. That corresponds to ~$940 monthly, so you're a bit below average in Serbia, but not alarmingly so. Rent seems to be $425-575 depending on the area, whereas in the US, rent is $1400-1700.

I'm not implying lifestyle is equivalent between countries just by comparing "cost of living", I'm merely pointing out that directly comparing costs isn't very effective. I could probably live a lot better on $50k in Serbia (would probably have servants and whatnot) than I could on $100k in the US (basically paycheck to paycheck in many parts of the US).