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John Cena on why he can't be his true self, marry Nikki Bella or quit WWE

arrives at the FOX's "American Idol" Finale For The Farewell Season at Dolby Theatre on April 7, 2016 in Hollywood, California.

arrives at the FOX's "American Idol" Finale For The Farewell Season at Dolby Theatre on April 7, 2016 in Hollywood, California.

John Cena just turned 39 and he's reportedly had more than 100 rehab sessions since he tore a rotator cuff last year.

His career outside the ring is thriving, with well-received film roles and a reality show on FOX.

And yet the 15-time world champion recently told Rolling Stone he isn't ready to give up his role as the face of the WWE.

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Cena is committed to his comeback, even though he revealed that he can't really be himself as the PG-rated good guy of the WWE. He misses the old days of wrestling with the profanity and, most of all, the blood.

And while Cena is loved by kids around the world, he's not interested in having any of his own. Neither is he interested in popping the question to girlfriend Nikki Bella, after a previous failed marriage.