John West - I Dont Think You Know chords

I heard this music in the movie "my first time" (French film), so I searched the 
agreements but I don't find them. There is not yet the words on internet and I am French so I 
don't understand all the words he sings :)
So I propose agreements that appear to be good and you give them. Meanwhile other 
agreements or tablature.

No capo


Intro (2 times): C G Dm Am

After it's C G Dm Am in the whole song.

At a moment in the song there's no guitare but as there is not yet the lyrics and 
recording studio on the internet I can not tell you where.
[ Tab from: http://www.guitaretab.com/j/john-west/319719.html ]