Is myself a pronoun?

Yes. the word 'myself' is a pronoun.
The pronoun 'myself' is a reflexive or an intensive pronoun.
The reflexive / intensive pronouns are: myself, yourself, himself, herself, itself, ourselves, yourselves, themselves.

A reflexive pronoun is a word that 'reflects' back to its antecedent.
example: When I got home I made myself a sandwich.

An intensive pronoun is a word that emphasizes its antecedent.
example: When I got home I made the sandwiches myself.