저는 is more polite way to expressing 'I/me'. You can use 저는 for older one, like case of 'I'm thirteen years old, teacher', or first-meet business partner like case of 'Nice to meet you, I'm Peter.' And '나는', we use it when conversate with friends, younger people. 나는 is a more basic then '저는', so when children learn a Korean, they first learn 나는.
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