With films such as "Rajneeti", "Ek Tha Tiger", "Dhoom 3" and "Tiger Zinda Hai" to her credit, she may have become one of the biggest female stars in Bollywood, but Katrina Kaif says it is tough to feel completely "secure" in movie business. Katrina believes film industry is changing rapidly and to stay relevant one needs to explore new arenas in the showbiz.

"I don't think you can ever feel 100 per cent accomplished and secure in your career because it is a rapidly changing industry. Things are changing so quickly. But now I do feel comfortable and confident here," Katrina told PTI, over phone from London, where she will be celebrating her birthday tomorrow.