I play it with capo on 3. Capo depends on your range haha..
I hope you'll like this tab.

Em          C
Give me an inch
           G           D
I promise I?ll take a mile
Em        C
Danger is beauty
     G               D
I?ll face it with a smile

Em       C
I?m on a mission
G       D
With no restrictions
Em           C
Don?t second guess myself
G              D
I?m born to be wild

Em              C
I?m the type of chick
              G            D
That likes to rock the beat
          Em         C
I like to rock the beat
          G         D
I like to rock, to rock the beat

[Chorus]

Em   C       G
21st Century Girl
D
I do what I like
Em   C       G
21st Century Girl
           D
I?m taking you for a ride
Em   C      G
21st Century Girl
          D             Em
Yeah, I?m gonna live it up
  C       G     D
Just live it up

End Em, C, G, and D goes through the whole song. :)