This might not match up to the song completely but you can still sing it in key 
without it sounding off ;)

Intro:
D A Bm Bm
D A Bm Bm

D.               A.     Bm.            Bm (x24432@1)     
  You shout it out, bUt I can't hear a word you say
D.               A.               Bm.         Bm (x24432@1) I'm talking loud, not saying much
D.             A.     Bm.              Bm (x24432@1) I'm critisized, but all your bullets ricochet
D.                A.             Bm.  Bm (x24432@1) You shoot me down, but I get up...

Chorus:
Em.                 A (x02220@1)  I'm bullet-proof, nothing to lose
Bm.       D (xx0232@1)  Fire away, fire away
Em.         A (x02220@1)  Ricochet, you take your aim
Bm.       D (xx0232@1)  Fire away, fire away
Em.                A.             Bm (x24432@1)  You shoot me down, but I won't fall
        DI (xx0232@1)am titanium
Em.                A.             Bm (x24432@1)  You shoot me down, but I won't fall
        DI (xx0232@1)am titanium

D.              A.         Bm.             Bm (x24432@1)         
  You cut me down, but its you who has further to fall
D.         A.            Bm.    Bm (x24432@1) Ghost town, haunted love
D.               A (x02220@1)Bm.                   Bm (x24432@1) Raise your voice, sticks and stones may break my bones
D.               A.                Bm.     Bm (x24432@1) I'm talking loud, not saying much

Chorus:
Em.                 A (x02220@1)  I'm bullet-proof, nothing to lose
Bm.       D (xx0232@1)  Fire away, fire away
Em.         A (x02220@1)  Ricochet, you take your aim
Bm.       D (xx0232@1)  Fire away, fire away
Em.                A.             Bm (x24432@1)  You shoot me down, but I won't fall
        DI (xx0232@1)am titanium
Em.                A.             Bm (x24432@1)  You shoot me down, but I won't fall
        DI (xx0232@1)am titanium

EmA Bm.         D (xx0232@1)        I am titanium
EmA Bm.         D (xx0232@1)        I am titanium

Em.           A (x02220@1)  Stone-hard, machine guns,
Bm.              D (xx0232@1)  Firing at the ones who run
Em.           A.               BmD
   Stone-hard, as bullet-proof glass

Em.                A.             Bm (x24432@1)  You shoot me down, but I won't fall
        DI (xx0232@1)am titanium
Em.                A.             Bm (x24432@1)  You shoot me down, but I won't fall
        DI (xx0232@1)am titanium
Em.                A.             Bm (x24432@1)  You shoot me down, but I won't fall
        DEm. (xx0232@1)               A.             Bm (x24432@1)  You shoot me down, but I won't fall
        DI (xx0232@1)am titanium