Things hidden in my mind

It already seems to have flown away,
Yet it is still here.
Why does it remain,
Trying to make a fool of me?
It disregards my wishes,
Seeking to be in control.
I will punish it!
I will prevail!
‘But first let us take a moment,
‘To enjoy that which is to be no more;
Liar! You trick me.
I know the way you are.
I hate you! even more,
Because you try to drag me under.
Why must I hate myself?
You aren’t a part of me!
So leave this place.
‘Then why am I here within your mind?
You are an impostor!
Only the truth can reign supreme!