Westlife singer Mark takes us back to his twenties and a major turning point in his life. After years of struggling to simply be himself he came out to his family and friends, and then when he was 25 - to the world. Mark talks to Vinny Hurrell about the huge pressure he felt, the anticipation and what happened next. Life would change forever. What advice would he give his younger self now? For details of organisations which offer advice and support with issues relating to sexuality or gender, go online to bbc.co.uk/actionline.