Nine Inch Nails - Discipline Lyrics

Am I - Am I still tough enough?*
Feels like I'm wearing down, down, down, down, down
Is my viciousness,
Losing ground, ground, ground, ground, ground?
Am I taking too much?
Did I cross the line, line, line?
I need my role in this
Very clearly defined

[Chorus 1:]
I need your discipline,
I need your help
I need your discipline,
You know once I start I cannot help myself

And now it's starting up,
Feels like I'm losing touch
Nothing matters to me,
Nothing matters as much

I see you left a mark,
Up and down my skin, skin, skin
I don't know where I end,
And where you begin

[Repeat Chorus 1:]

I can not stop myself.
Once I start I can not stop myself.

(x7)And you knew,
That once I start I can not stop myself.

[Chorus 2:]
I need your discipline,
I need your help.
I need your discipline
Because once I start I cannot stop myself.

• Anonymous

  Sounds like he's talking about drugs. "Once I start I cannot stop myself" could be that if he starts drugs, he can't stop. "Am I taking too much?" seems to be a worry that he's gone too far with the drugs.
  "I see you left a mark/ up and down my skin." A needle? And he needs someones (don't know who's/what's) discipline to help keep him clean.