Justin Bieber - One Life chords

my first tab, i have no idea if its right, except that is sounds right.

Capo on 1st fret

Am, Em, G, Am throughout the whole song
[ Tab from: http://www.guitaretab.com/j/justin-bieber/379281.html ]
Am
Show me where you at, let's keep it honest
Em
Home is where you at and that's a promise
G
Open up and never keep it from us
Am
Nothing left between us, baby, nothing

Am
Tell me what you want, let's keep it gangsta
Em
Tell me who created you, I'd thank her
G
Open up and never keep it from us
Am
Nothing left between us, baby