These are the 4 Chords involved in the song in order, F, Dm, Am, B. All of these 
are in a bar chord shape. 

F
Last week, I was passenger on a car seat
Dm
Thinking of decision that I made within a heart beat! 
Am
She used to make my heartbeat but usually alarms me my lungs are over
B
Working and I (cant breathe)

And the Chorus is the same F Dm Am B.

Enjoy :)