Roger Goodell to Marshawn Lynch -- QUIT YER BITCHIN' ... Media Day Is Part Of Your Job!

NFL commish Roger Goodell has a message for Marshawn Lynch -- stop being a baby and do your job ... which includes answering questions from the media.

Goodell is clearly not happy with Marshawn's Super Bowl Media Day "I'm Just Here So I Won't Get Fined" stunt -- and moments ago, he took Beast Mode to task in front of the very reporters Lynch snubbed earlier this week.

Goodell explained that talking with the media is part of Marshawn's job, whether he likes it or not.

"There are a lot of things we don't like to do in our jobs, but it comes with the territory ... and it comes with the privilege of playing in the Super Bowl."

We'd call Marshawn for comment, but ... well ... you know.