우리 basically means we/our/us but it can be mean my in some contexts where you are talking about your own family or when you sharing a thing with others.
EXAMPLE:
우리 엄마 - My mom
우리집 - My house [even if you live alone]
우리 아빠 - My father내 is officially mean me/my. You will use 내 when you live alone or that thing is just your own thing without sharing to others.
EXAMPLE:
내 차 - My car
내 핸드폰 - My handphone

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KOREAN VOCABULARY LEARNING
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