If something belongs to you – whether it is tangible or not – you don't need an apostrophe to prove it. It's yours, not separated or divided.

It is your car, your house, your shoes, your intention, your decision.

You're, on the other hand, is a contraction of 'you are', the two words run together with an apostrophe popped in to show where 'a' has been left out.

You're just leaving your house, then you're going shopping.

Memory jogger: If it belongs to you, keep it together; you are can be split apart.

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