Britain's first youth crime commissioner said she was "truly sorry for any offence" caused.
Paris Brown, 17, from Sheerness, Kent, was appointed to the £15,000-a-year post only last week.
Speaking at a press conference in Maidstone, Kent, Miss Brown said she had "taken the decision to decline the offer of the position" as she felt recent media attention would affect her ability to carry out the job.
She added: "I am truly sorry for any offence I have caused."
More top news
There will be a mixture of sunny spells and showery rain this afternoon, with highs of 16C in the south of England.
CCTV footage has emerged of a violent attack where a blind man was pushed onto the tracks at Chelmsford station
A farm owner has been jailed in south Wales after forcing a "vulnerable" labourer to work for free for 13 years while living in squalor.