Banished Traitors contestant Alyssa Chan said she knew she had no chance of winning after just three days.
The 21-year-old said she felt “crumbled by guilt” after being picked to be a traitor.
In the reality show, filmed in a beautiful Scottish castle, 22 players take on daily tasks to top up a prize pot.
But three have secretly been assigned as traitors.
Each night the trio meet to decide which of the others – the faithful – to “murder”, ie evict.
The whole group meet during the day to vote off a suspected traitor.
If no traitors remain at the end, the faithful split the prize cash. But any remaining traitors take the lot for themselves.
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Alyssa’s close ally Wilfred Webster, 28, voted her out during a daytime “roundtable” voting session.
She said: “I was so shocked. That’s the first time in the game that I was angry, because I was blindsided.
“You genuinely feel like it’s life or death. I can’t tell you how immersed in the game you get. I felt like it was a witch-hunt for me and I was just terrified.”
Alyssa said fellow contestants surprised her by being understanding about her being a traitor.
Half-Irish, half-Chinese Alyssa, who is studying for a business degree, says she has no idea who eventually wins the cash, which could swell to a maximum of £120,000.
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Backstabber Wilf has since said sorry for his actions on the show, currently the BBC ’s second most popular after the world Cup.
She said of the fundraiser from Peterborough: “We’re good friends now. Props to him, he played a great game, he did it brilliantly – and I just couldn’t do it. The guilt was just so huge, I couldn’t cope with it, I crumbled.”
Next year’s players will have a better idea of the best strategies in the game, she said, as this year’s 12-parter is the show’s debut.
She advised any wannabe players: “Be emotionally and mentally stable for it because it’s a lot to take on.”
But host Claudia Winkleman, above, was “brilliant, Alyssa said.
The Traitors returns to BBC1 and iPlayer on Tuesday.