Is you a type of noun?

No, the Word 'you' is not a noun. The Word 'you' is a pronoun, the second person, personal pronoun (a Word that takes the place of a noun for a specific person or thing). The pronoun 'you' takes the place of a noun (name) of the person or people spoken to. Examples:

John, you are a good friend.

All of you will be given a chance to speak.

I can help you with that, mother.