Mental health is like beauty. If you average all the women in the USA's facial features together, you'll get someone most people find super attractive. If someone has average features, they're seen as most attractive, but it's rare for most people to be that close to average. Most people deviate from the norm; that's just statistics. Mental states are the same. Everyone has quirks, so most people aren't perfect paragons of normality. It's probably even rarer for people to be perfectly mentally well than for them to look like a Greek deity, because mental health has so many more factors involved.

Anyway, someone who's perfectly normal in the West would be fucked up. Not to mention boring.

TL;DR: Nobody is normal. Being abnormal is normal. Look at bell curves.