Is it hard? Lots of people learn more than one language. Lots of people grow up with more than one language, lots of people learn a different language in childhood, lots of people learn another language in adulthood.
People even learn dead languages like Latin or Ancient Greek, or made-up langauages like Klingon.
I do not think your premise is in any way correct. Humans clearly do not find it hard to learn different languages.
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