Why are my arms, hands, legs and whole body darker than my face?

My face is sooo pale and has been like that forever but not when i was younger. Im 16 now, when i was up to 11 years old i was tan, and in the summer my face gets really dark only. Im of bosnian and polish descent. But in my teenage years i had anger issues from 8-12 and now i have just been chronically stressed for many years. How do i get a permanent tan on my face so it matches my dark arms? Can a pale face be caused by stress and not enough sleep? I also used to not sleep enough for years.

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+1 y
My sisters face is tan. My moms is. Its bad
Why are my arms, hands, legs and whole body darker than my face?
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