Raul Rosas Jr. -- the 17-year-old who just inked a UFC deal -- is one of the most badass high schoolers in the world ... but, RR's so young, he tells TMZ Sports his mom and dad had to sign his contract!
It's a history-making signing for the UFC ... who made Rosas Jr. the youngest fighter to sign with the promotion after the teenager beat 25-year-old Mando Gutierrez earlier this week on the Contender Series.
We talked to the newest/youngest UFC fighter just days after inking the deal ... and while we may all be surprised he's reached this level as fast as he has, he isn't.
"No, not really [shocked] because I've been working my whole life for this moment. Right now, everything going into existence, but I'm grateful for this opportunity, but not impressed."
FYI, Rosas Jr. is 6-0 professionally (and 6-0 as an amateur) ... and fights in the bantamweight division.
The funny part ... 'cause Rosas Jr. is still a minor, his parents had to sign his contract.
"My parents got to sign too because I'm a minor. So parental guardians got to be on there, too."
But, make no mistake, this kid can fight ... and if you want to see how excited the UFC is for his arrival, just listen to Dana.
As for the reaction of his friends and peers, the 12th grader says many of his classmates are pumped about the achievement.
"A lot of them are happy and excited because they don't really know how this process works for me to get to the UFC. I never really explained it because it's a long process. They just like since middle school, like 'Hey when is Dana White gonna sign you?' Or stuff like that."
Lastly, we asked Raul if anyone messes with him at school.