Contradictions

I just want to fight, that's all
Scream and yell, shake you
Punch my fist through that wall.
But I can't, because it's all in my head,
A place you've never been;
I've never let you in.
Instead I've walled you out.
Every second I feel myself place
Another brick, I can't stop it.
If only you understood, then I could
Scream and yell and tear down the stars
And everything would be OK.
But it's not. And I don't know if it will be again.