In a stark message to Tory plotters seeking to oust her from Downing Street, the Prime Minister claimed she felt fully secure in her post and was not going anywhere.
She also said she was enjoying her role while admitting her Government duties left her little time for relaxing in front of the television.
“I never get to the end of a box-set,” she joked.
Mrs May was repeatedly asked about Tory leadership speculation during an interview on the ITV1 This Morning show today.
She rejected suggestions from the programme’s hosts Philip Schofield and Holly Willoughby that she had to constantly lookout for rivals within the Government who might stab her in the back.
Asked by Mr Schofield whether she felt secure in her job in the face of media speculation about leadership challenges, Mrs May said: “Yes. I’m doing the job and I’m going to jolly well get on and do it.
“What drives me in doing it is actually not what’s written, but what people out there want the Government to do. That’s the important thing.”
And when she was asked whether she was always watching out for colleagues who might stab her in the back, she said: “No. For me it’s actually all about what I’m doing to deliver for the public.
“That’s why I was on doorsteps in my own constituency on Saturday afternoon, talking to people, hearing from them about the issues that really matter to them.
“That’s what drives me, that’s what politics is about.”
When asked whether she was enjoying her time in Number 10, the PM replied: “Yes. Throughout my life, whenever I’ve taken jobs on I’ve never thought ‘Oh, it’s going to be like this or like that’. I just get on and do it.
“There’s huge issues to be dealing with, but it’s worthwhile if we can help children in school to not be bullied, if we can keep children safe on the internet, if we can say to a young person today who’s worried that they might be pushed into university when they don’t want to, ‘No, there’s going to be a different route for you’.”
Asked by Willoughby whether she ever had the chance to kick back and relax in front of the TV, Mrs May laughed and said: “I never get to the end of a box-set.
“It’s a job where you are constantly thinking about it and obviously anything can happen at any point which means that you have to really get involved. I enjoy things like cooking and walking and so forth.”
Mrs May has been dogged by speculation about her future ever since the snap general election she called last year ended with the Tories losing their Commons majority.
Several Tory MPs are understood to have told Graham Brady, chairman of the 1922 Committee of backbenchers, of their willingness to write letters calling for a leadership contest in an attempt to force her out.
But the Prime Minister has repeatedly insisted she is “getting on with the job” and has refused to rule out leading her party into the next general election, due in 2022.
Some Tory insiders suspect she will be forced to stand aside after Britain’s expected exit from the EU in March next year.