All of the reflexive pronouns contain the word 'self' in the singular or 'selves' in the plural.

They are: myself, yourself, himself, herself, itself, ourselves, yourselves, themselves.

Self-reflexive refers to something that reflects on its own structure or nature within the work itself, often breaking the fourth wall or drawing attention to its own artifice. Self-reflective, on the other hand, usually pertains to introspection or contemplation on one's own thoughts, actions, or experiences.

No, "yourself" is not a preposition. It is a reflexive pronoun that reflects back to the subject of the sentence.