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"My" is an adjective which is often translated as "mi", and "myself" is a pronoun which is often translated as "me". Learn more about the difference between "my" and "myself" below.
my()
An adjective is a word that describes a noun (e.g., the big dog).
1. (possessive)
myself()
A pronoun is a word that stands in for a noun (e.g., she).
1. (reflexive)
2. (emphatic)
c. mí mismo (masculine; used after a preposition)
I'm going to do it for myself.Voy a hacerlo por mí mismo.