31 years later, he's changing the football community with his coaching ability as the JV coach of Prospect High School in Saratoga, Calif. and inspiring the world with his story.
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He doesn't let his condition stop him.
In fact, he will be honored at the 2019 ESPY Awards as the Jimmy V perseverance Award recipient and was on the cover of ESPN Magazine's heroes edition.
Now he has everyone asking, "who says I can't?"
RELATED: Football coach born without arms or legs to receive Jimmy V Award for Perseverance at 2019 ESPYS
"'Who says I can't?' is an original statement for myself to always be determined and stay hungry in life," Mendez said. "It always kept me hungry. I love when the kids say 'nobody', because it's true. Nobody but yourself can hold yourself back. That's what I've realized over the years."
Not having arms or legs has stopped Mendez from being able to play sports or do certain jobs he has always been interested in, like being an electrician, but he always fought to find ways to be happy.
One way he was able to do this is through coaching football.
He started as a manager on his Gilroy High School team as a freshman.
At 18 years old, he moved up to be the quarterback's coach on his high school's football team.
As he was not able to play football, Mendez taught himself the game by playing Madden football video games.
He developed a great football mind, but he wanted more.
"It's only natural to never give up," Mendez said. "I've always been like that ever since I was young. I guess that from my nurturing from my parents and my determination to be successful in life, as well as all the doubts along the way, I've become more hungry along the way to just be accomplishing in football and in the career of coaching. I've always wanted to be a head coach."
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After 12 years of working, Prospect High School gave him that chance.
"When I first met him, he blew me away with his personality," Prospect Football Varsity Head Coach Mike Cable said. "As he approached, I didn't know how he could be a football coach. But as soon as I met and spoke with him, the chair disappeared. I saw in front of me a man who loved football and kids. I just knew he was the right man for the job."
Mendez learned to diagram plays by using a pen in his mouth.
Some of his plays even came from playing Madden.
In his first full season as head coach, he led the Panthers to a playoff birth and a near-perfect season.
The pain of the loss hurt, but it did not stop his fire.
"I've always been someone to be not afraid of failure," Mendez said. "Be bold and fail, be bold and fail, be bold and succeed. It's just natural to just be bold and try things in life. Eventually you will come across your passion and for me it was football and working with people. 'Who says I can't?' was something that was very much for me to always stick with and I hope people take away from it in a positive way where they are comfortable to motivate themselves to do whatever they want in life."
Mendez has made stops at many different schools across the Bay Area, including Sobrato High School in Morgan Hill, Calif. where he met Coach Tim Alvernaz. Alvernaz hired Mendez to be on his staff, but then followed Mendez to Prospect to be his number two.
"He's an inspiration to all of us," Alvernaz, said. "Honestly, when I first hired him at Sobrato High School, I knew he was something special. He knew his offense, he knows his x's and o's and he brings an energy to the team, the players and the rest of the coaching staff. I love it. I love him. He's a great guy and I'll go to the end of the earth for him."
That sentiment has been followed by so many other coaches that he came across in his career.
His resiliency inspired others around him and made it an asset to have him on the staff.
When Mendez first took over the coaching job, many kids on the team were surprised to see a man with his condition coaching them.
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But coaches on his staff says he only used that as an opportunity to teach and motivate once again.
"His mind is the greatest thing," Prospect JV Assistant Defensive Coordinator Todd Livingston said. "When an able-body person says that they can't do something, his greatest message is, 'who says I can't?' His presence should tell anyone, if you're paying attention, that your mind is the most powerful thing. The positiveness of your mind can get you to do unbelievable things and feats and that's what he does."
"Who says I can't?" has become a motto for the Prospect Football teams and, of course, for Mendez.
However, the phrase was not born on the gridiron.
It actually came well before Mendez started coaching football.
"It first actually came from a friend challenging me at an 8th grade dance," Mendez said. "He told me that I couldn't go out there and dance with a girl. I said, 'oh yeah? Who says I can't?'"
Soon, it will be a nation-wide phenomenon when Rob Mendez accepts the 2019 Jimmy V Perseverance Award at the ESPYS on July 10.
While he knows that day will be a life-changing experience, he remains humble.
Mendez gains happiness and joy through helping others and that will be his message when he takes the podium for his acceptance speech.
"The one thing that I want people to see is just how hard work pays off," Mendez said. "I just think that me showing people that I can accomplish my goals, which actually still is not really completely fulfilled yet. I definitely want to be a varsity head coach, if not, advanced in the college career or the NFL. I hope that 'who says I can't?' can show people to be happy with who you are and hopefully they understand the true meaning of it which is believing in yourself."
Watch the 2019 ESPYS Awards only on ABC7 on July 10, 2019 at 5 p.m. PST.