We know you have what it takes to succeed. But, what about those days when self-doubt sets in and you don’t believe in yourself? Recent research shows that one in three young people don’t believe in themselves. Fronted by 15 inspirational ambassadors – including Dame Helen Mirren, Cheryl, Katie Piper, Marcus Butler and Louisa Johnson – each sharing their own very personal stories in a series of films highlighting how they themselves have been affected by self-doubt