The use of reflexive pronouns — compounds of a personal pronoun (my, your, our; him, her, it, them) and -self/selves — is grammatical only (1) when the subject and an object are the same:
07.09.2016 ·Tiger [Woods] found himself in this situation because he kept falling into the same trap: He didn't give himself enough time to recover, came back too soon, and re-injured himself. — USA Today
or (2) when used for emphasis following a noun or pronoun (in bold):
Perhaps because we ourselves have become bored with ourselves? Is man himself now supposed to have become bored with himself? — Martin Heidegger, The Fundamental Concepts of Metaphysics: World, Finitude, Solitude, 1995.
The use of myself instead of I/me has never been limited to those of low education or social status:
Her Royal Highness, her lady of honor, my sister, and myself, went up in a sort of car on two wheels, drawn by oxen, which is the best equipage the country affords ; the rest of the household were on foot. — George IV, King of Great Britain and Ireland (“with” John Wilson Croker), A Letter from the King to His People, 1821, 35.
Particularly in the structure in question, as well as the allied myself included, even educated elites may substitute myself in including me. A Google Books NGram shows that the grammatically incorrect myself rivals the correct expression, which along with the equally incorrect myself included shows a considerable increase in frequency since the 1960s:
I myself (see what I did there?) never use including myself, but in less formal speech have no qualms about myself included. I think of it as one of those illogical but thoroughly idiomatic expressions such as It's me, but try to avoid it in formal writing.