The Prime Minister, whose call for a snap general election was approved by the House of Commons, was speaking in Maidenhead as she begins her bid to reclaim her constituency seat.
Mrs May promised Britons she would be the right leader in delivering to Britons on their decision to leave the European Union, claiming she will achieve the "right deal for Britain".
The Prime Minister said the people want the Government to get on with Brexit as she vowed to fulfil their wishes.
She said: "When I took over as Prime Minister people were predicting there was going to be immediate financial crashes and economic danger.
Theresa May launched her campaign confirming foreign aid commitments will remain
"Instead, we've seen consumer confidence remain high, economic growth beyond all expectation and record numbers of jobs created."
Mrs May added she now sees a "unity of purpose" across the country with people urging her to "get on with Brexit and make a success of Brexit".
In an attack on her opposition rival she said there was a very clear choice between "strong and stable leadership under the Conservatives or a coalition of chaos led by Jeremy Corbyn".
"Actually getting the right deal in Europe matters," she said. "It is in the best interests of this country, and I want a deal that is going to work for people across the whole of the country.
"I also want to recognise that Brexit isn't just a process, it's an opportunity to change this country for the better, for the future."
After criticism over her refusal to face the opposition leaders in televised debates, Mrs May answered questions from workers and journalists attending the speech at GSK's Maidenhead facility.
The Prime Minister, after a question, confirmed a commitment from the Conservatives to spend 0.7 per cent of national income on foreign aid would remain in place, following recent speculation it would be scrapped in her latest manifesto.
Mrs May said the pledge “remains and will remain” and that she is proud of the work the UK is doing abroad, for example helping to tackle the Ebola crisis in Africa or supporting Syrian refugees.
However, she stressed the need to ensure the money is spent “in the most effective way” but her comments end the speculation surrounding the policy.
Baroness Camilla Cavendish voiced concern other the spending pledge made by David Cameron in his last Conservative manifesto, claiming Britain was sending too much money overseas while still running at a deficit.
She said: "I've always been concerned that it is too high and I'm concerned now when we're still running a deficit and because of Brexit.
"We have a Conservative Government that is no longer committed to producing a surplus by 2020, which the Cameron-Osborne government was committed to, rightly because we don't know what economic perils lay ahead.
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Labour leader Jeremy Corbyn reads with children as he visits Brentry Children Centre in Bristol, during Labour's election campaign
She, however, said there was an argument to be made to keep the spending pledge, adding: "It is under threat as you know because the UK is the second largest aid donor in the world. A lot of people feel that's too much.
"I was an aid worker many years ago myself. You and I both know when you try and go into very, very poor countries to deal with sometimes very corrupt government, some of that money is wasted.
"That's just a fact. There is a decision to be made whether we want to continue with this level or not."
Lord Michael Howard, who first wrote the policy into the party's 2005 general election manifesto, claimed he supported the spending because "we owe a duty to those who share a planet with us".
He said: "I think it does a tremendous amount of good and I think it increases our influence and talking about migration if you want to limit migration then you have got to improve conditions of life in countries in which these people live."