myself
pron.the word you use to refer back to yourself when you are the person doing the action. It is also used to emphasize that you did something personally without help.
pron.the reflexive form of the first-person singular pronoun, used as the object of a verb or preposition when the subject is also 'I'. It also serves an intensive function to emphasize the identity of the speaker.
“I bought myself a new book today.”
“I prefer to do the repairs myself because I want to make sure everything is fixed correctly.”
“While I could have delegated the task to the junior staff, I felt it was important to present the findings to the board myself to ensure total clarity.”
Used reflexively when 'I' is the subject; also used for emphasis after a noun or at the end of a clause.
Learners often use 'myself' as a subject pronoun in compound subjects, but 'I' is the correct form for the person performing the action.
Usage myself included
From Middle English myself, meself, from Old English mē selfum and similar phrases, equivalent to me + self, later partly reinterpreted as my + self / -self. Cognate with Scots mysel, mysell (“myself”), West Frisian mysels (“myself”), Dutch mijzelf (“myself”), German mich selbst, mir selbst (“myself”), Norwegian Bokmål meg selv (“myself”).
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.