A very similar story to its vs. it’s, the two versions here are a possessive pronoun and a contraction.

You’re is a contraction that joins the two words You Are.
If you can’t replace the you’re with the words “you are,” you’ve got the wrong one!

Examples:
  You’re never going to believe what I found in your shoes.
  You are never going to believe what I found in your shoes.

You’re can be changed to you are, so it’s the right one!