Washington - Democratic US presidential nominee Hillary Clinton says she has "work to do" to earn voters' trust and move past the "caricature" many people have of her.In a wide-ranging interview on Fox News Sunday, Clinton said the majority of voters approved of her work as a US senator and as Secretary of State under President Barack Obama. But upon running for any office, she said, "all of these caricatures come out of nowhere, and people begin to undermine me".Polls have indicated that voters question Clinton's trustworthiness. "I think it's fair for Americans to have questions," she said.But unlike her rival Donald Trump, "I have a long record of public service I can point to that's actually produced results for people."Clinton also revealed that controlling her emotions was her biggest concern walking on stage at the Democrat National Convention to become the first woman to lead a major party ticket.She said she was afraid she might cry after seeing her daughter, Chelsea, on stage. She also thought how proud her own mother, who died in 2011, would have been of her. Clinton said the moment was "over-the-top emotional" and "I was pretty concerned whether I'd make it through the speech."