Kate Winslet
Oscar winner Kate Winslet constantly doubts her acting talents when she is filming.
The 48-year-old British star still convinces herself that she is "rubbish" when it comes to conveying the right emotion for the cameras.
Speaking to the Daily Mirror newspaper in 2013, she said: "What people really think of me is something I remain blissfully unaware of most of the time. I love acting and all I ever try to do is my best. But even now I always dread those emotional scenes. I’m there thinking, ‘Oh my God, I’m rubbish and everyone is going to see it. They’ve cast the wrong person.’ But I have come to realize that those nerves are all part of the process for me."