I used to think in Britney Spears' song "Baby one more Time" instead of "My loneliness ... is killin me" I thought she sang "my lonely ass...is killin me".
A childhood belief about misheard lyrics

others believed things like this
- when i first heard "i'm a slave" by britney spears i thought she was saying "i'm a snail forever" — jessica
- i thought I got one year older when my family sang the birthday song.— I am the ghost
- for my little sis -
Paul McCarty song "Band on the Run" but when she sang it it was "Man has the Runs"Anon - I used to think that the actors on tv shows sang the show's theme song.Anon
- Until I was about 15, I beleived my Father was the person who sang the "Cheers" TV Show Theme Song.— Dustin
- Billy Squire sang about "My Kind of Lover". My wife sang about "My Candelabra"— Wailerman