Richard Madden said he constantly doubts himself as an actor as he picked up a Golden Globe for his role in Bodyguard.
The Scottish actor, 32, won the best actor in a TV drama prize, seeing off competition from Ozark's Jason Bateman, Homecoming's Stephen James, Pose's Billy Porter and Welsh star Matthew Rhys, who was recognised for his part in The Americans.
Speaking after accepting the honour on stage at the ceremony in Los Angeles, Madden said the award was a "wake-up call" that will give him more self-confidence.
He said: "You constantly question yourself as an actor, if you're good enough, if you're real enough or if you're deserving of anything and that's a constant thing that you're doing for yourself.
"Kind of questioning your ability, so to even be nominated was a real confidence boost in terms of thinking 'I am doing this, I can do this'.
Read more: Richard Madden on new BBC drama Bodyguard and avoiding Game of Thrones spoilers
"And then I've won it. So I'm kind of blown away by it because I've been active for 20 years, never thinking you're good enough, I suppose. And then to receive something like this, I suppose it's a wake-up call to me to be like, believe in yourself more because other people do."
Following his roles in Game Of Thrones and Bodyguard, Madden has been named as a potential successor to Daniel Craig as James Bond.
When asked about taking the job of 007, Madden said: "They are just rumours."
Fellow Brits Olivia Colman and Christian Bale also triumphed at the awards, where Bohemian Rhapsody and Green Book were the big winners of the night.
Broadchurch star Colman took home the best actress in a comedy or musical prize for her role as Queen Anne in black comedy The Favourite and thanked her co-stars Emma Stone and Rachel Weisz.
She added: "Every second of working with you was such a joy and I was so sad that it finished.
"I would like to tell you how much working on this film meant to me but I can't remember because I'm too excited."
She added: "I went on a private jet and I ate constantly through the film and it was brilliant and I promise I will keep on enjoying this, because it's amazing."
Bale scored the best actor in a musical or comedy for his role as the former vice president Dick Cheney in Vice and thanked his director, Adam McKay.
He joked the filmmaker chose him because he thought "I have got to find someone who can be completely charisma-free and reviled by everyone, it's got to be Bale".
He joked he would play Senate majority leader Mitch McConnell next, adding: "Thank you Satan, for giving me inspiration for this role."
Meanwhile Ben Whishaw was honoured in the best supporting actor in a limited series or TV movie category for playing Norman Scott in A Very English Scandal.
Whishaw thanked the BBC for continuing to make "idiosyncratic and powerful work", as well as his co-star Hugh Grant and writer Russell T Davies as he collected his gong.
He dedicated the award to Scott, praising him for "taking on the establishment with a courage and a defiance that I find inspiring," calling him "a true queer hero and an icon".
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