Here's why:
* Third person refers to someone or something that is being spoken about, not directly addressed.
* "Your" is a possessive pronoun used to indicate something belonging to the person being spoken to.
Examples:
* Third person: "She went to the store." (Speaking about "she")
* Second person: "Your car is beautiful." (Speaking directly to the person who owns the car)
Let me know if you have any other grammar questions!