Paida Mutopo was nervous meeting Prince Harry and Meghan Markle.
The 21-year-old, who was born with HIV, told them about herself during their first official engagement together in Nottingham yesterday.
"I never thought the day would come when someone as high profile as Prince Harry would be supporting this cause," she tells Newsbeat.
"It means a lot to me that he is actually taking his time to go and work with people affected by this disease."
Paida chatted to the couple as they visited Nottingham Contemporary Exhibition Centre for an event to mark World Aids Day.
"I still can't believe it's real," says Paida, who has been recognised for her work in raising awareness of HIV, which attacks the immune system.
"I was so nervous until they started talking to me and they actually recognised my work.
"They're a lovely couple and I know that they're passionate about raising awareness and trying to tackle the stigma surrounding HIV."
"I didn't get diagnosed until I was 10. I became ill and my mum didn't know what was wrong.
"So she got me tested. That's when we found out that both me and my mum were HIV positive."