And I think It's so impressive I’m riding in the back
Young and black ’cause I’m chauffeured and not ’cause I’m

from DJ Khaled (Ft. Ace Hood, Big Sean, T-Pain & Wiz Khalifa) – I'm So Blessed Lyrics on Rap Genius

Meaning

Big Sean is sitting in the back getting driven around, like a boss. Instead of sitting in the back heading to a jail, hes headed to a lavish hotel, airport, concert, etc…
He feels good about it because many black males his age don’t become as successful quickly as him, if EVER.

This isn’t the first time Sean mention beating the odds of a black male in America. Here in Wale’s “Slight Work” brings up a similar subject.

“Under 25, living the fuckin life
White America said I’d be doing 25 to life
And just for that, I'mma blow 25 tonight
You make 25 a year, I make 25 a night, whoa!”

http://rapgenius.com/Wale-slight-work-lyrics#note-415596

This could also be a double entendre for “back” Sean may be riding in a luxury maybach.

To help improve the meaning of these lyrics, visit “I'm So Blessed” by DJ Khaled (Ft. Ace Hood, Big Sean, T-Pain & Wiz Khalifa) Lyrics and leave a comment on the lyrics box