Jason Derulo - In My Head chords

I was steaming through some Youtube videos and found two good covers, but they were
I basically mixed their (wrong) chords together to get the right ones and for the right
There's only 3 chords that you play through the whole song: Am, C, and G. in that order. 
truly like the song and wanted to learn how to play it and you may. Enjoy!

Capo on 3
[ Tab from: http://www.guitaretab.com/j/jason-derulo/224812.html ]
Am, C, G

  Am
E|-x-|
A|-x-|
D|-2-|
G|-2-|
B|-1-|
e|-0-| (x 4) (Count: 1 and 2)

  C
E|-x-|
A|-3-|
D|-2-|
G|-0-|
B|-1-|
e|-0-| (x 4)(Count: and 3 and 4)

  G
E|-3-|
A|-2-|
D|-0-|
G|-0-|
B|-0-|
e|-3-| (x 8)(Count: and 5 and 6 and 7 and 8)

Play with the actual song a couple of times and you'll get it.