Reflection.

When you look into a mirror,
You can see who you really are.
Not the one you're pretending to be,
But the one you should be.
When you look into a mirror,
You can see your reflection
You know what you see,
Isn't really you at all.
It's an evil twin,
oming out of yourself.
That's trying to switch places,
And ruin the life you have made so far.
To make a horrible outcome,
Which will make you lose everything.