Im not sure, but I do not think there is unless people do not have proper grammar...
myself
i give myself presents on my birthday!!
if the word after it begins in a vowel
No, the word myself is not a conjunction, it is a pronoun.
the anser is that you can use it in a sentence if you use it right. like... i like to play games by myself.
I'll be keeping thatlittle secret to MYSELF!!
The subordinate clause in your sentence begins with the word before.
I painted myself in a corner.
my twin is like a duplicate of myself
i treat myself with an i phone
it depends what word it is it could be any part of speech depending on the sentence
Myself is a pronoun (intensive or reflexive, depending on the context it is used in the sentence)