The singer reached number two with the song on Sunday's Official Top 40 chart and has described the experience of releasing music as "incredible".
"It doesn't happen to a lot of people and the fact that it's happened to me and I'm only 17 - it's quite incredible actually," she told Scott Mills on the Official Top 40 App Cast.
"'You Bring Me Joy' was probably the perfect first single for me because it kind of described me as a person. It's a bit of a dance record, but it's still got that edginess to it which isn't too generic."
Lily is expected to release her second single later this year with her debut album to follow shortly after.
The Official Top 40 Chart App offers exclusive mobile access to the latest chart news on your Samsung. The app can be downloaded via the Google Play store.
Listen to Amelia Lily's interview with the Official Top 40 Chart App below: