myself

myself /maɪˈsɛlf/ pronoun
myself
/maɪˈsɛlf/
pronoun
Britannica Dictionary definition of MYSELF
1 
: the person who is speaking or writing:
a  — used as the object of a verb or preposition to refer to yourself after you have already been mentioned
b  — used for emphasis to refer again to yourself after you have already been mentioned
2 
: my normal or healthy self

by myself

1 
: without any help from other people
2 
: with nobody else : alone