Get bitten by mosquitoes and stay healthy

I've lived in a tropical environment most my life and I remember growing up as a kid, suffering from Malaria a couple of times.

Contrary, in my adulthood I've suffered from Malaria only a handful of times (in between a couple of years.)

I can't remember when I stopped sleeping in mosquito nets, but I know for sure that I get bitten by a scourge of mosquitoes every goddam night. And I haven't suffered from Malaria in more than half a decade.

Is this normal?