This really worked for me, I liked the repeated lines, and the emphasis on the point of your title and how you explained this through your wording.

Powerfully worded.

I said I wouldn't
Become like them
But I lied to myself
And that's what I've become

sucks when you become something that you don't want to be.... seems like that I relate to this very well not just the emotions but also the subject matter.... for me if flowed well so nice word choice... usually repetitive lines get tired but not this, read well in me mind.... nice work! !