Nearly a quarter of girls aged 14 (22%) said they had self-harmed in just a year according to a new report by The Children’s Society. One in six (16%) of more than 11,000 children surveyed reported self-harming at this age, including nearly one in 10 boys (9%). The self-harm statistics follow new analysis included in the charity’s annual Good Childhood Report, which examines the state of children’s well-being in the UK.  The report looks at the reasons behind the unhappiness…