Urge/ Unbearable (not sure. which one to you prefer. or maybe Unbearable

You can't stop crying
And only one thing can help

The urge in unbearable
All it takes is one cut

A little cut
No one would need to know

But if you're asked
Could you lie?

You don't want suffer the consequences
And you know its wrong

But it's the only way to stop the pain
And the urge is unbearable