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
ITV Border Political Editor Peter MacMahon says it's far too early to call this referendum.
A World War Two veteran has told ITV News he has fulfilled a boyhood dream by voting for an independent Scotland.
Keep on top of the referendum results as they are announced from 32 counting stations across Scotland.