Myself (pronoun)

1. Pronoun: used to refer to the speaker or writer as the object of a verb or preposition when they are the subject of the clause.
2. Pronoun: used for emphasis.

Origin:

From middle english myself, meself, from old english mē selfum (“myself”), equivalent to me +‎ self. .

Examples:

1. I told myself I wouldn't eat any more cookies, but I did.
2. I made the cake myself.
3. She herself chose the decorations for the party.