Alia Bhatt's sister Shaheen Bhatt has confessed that she has been suffering from depression since her childhood days. Opening up about her in an exclusive interview to ANI, the 31-year-old author said that she was diagnosed with clinical depression when she was just 12 years old. In her book -- 'I've Never Been (un) Happier' she has opened up about her struggle of battling with this mental disease. "I have been living with depression since I was 12 years old and now it's been 20 years with depression. The book is about my journey with depression and my experiences, how I have lived with it, gone through it and how I dealt with it and what I learnt from it."