I want you to’ is telling someone that you have a desire or would like for them to do something.

Here are some examples:

I want you to clean the dishes.
I want you to come home right after school.
I want you to call once you get there.
I want you to explain yourself to me.
I want you to educate me.

By using the word ‘need’ instead of ‘want’ you are expressing something that is required or wanted.

Here are some examples:

I need you to study harder in school.
I need you to stop and listen to me.
I need you to greet our guests.
I need you to introduce me to your family.
I need to request a refund.

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