"You're resentful of how human nature can change: when you retire, people no longer look up to you as an amazing fighter.
'He's overweight, he's not who he was.'
They talk to you like they talk to anybody, whereas when you're a fighter, they talk to you with respect," Nelson said.
Reflecting on his early perception of his career prospects, Nelson shared his educational background.
"I thought boxing was the only option I had," Nelson said.
He acknowledged his early academic struggles while reflecting on his journey to becoming a respected sports pundit.
"I left school with the reading and writing ability of a 10-year-old. I wasn't thick - I just wasn't academically astute - but I thought I was.
I'd got nothing on paper to say, 'Johnny is really good with people,' so that wisdom doesn't get you a job," Nelson said.
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To address structural financial issues, Nelson is currently working with parliamentarians, financial institutions, and boxing authorities to establish a mandatory pension scheme paying two thousand pounds annually to active fighters.