For years during my childhood (I'd have been between 8-12 ish) I thought the chorus line in J Geils Band's 'Centrefold' was 'My girlfriend is the centre forward'. Have a listen, it's not impossible to get wrong!
A childhood belief about misheard lyrics

others believed things like this
- I used to believe that there was only one lighthouse in the world and it was at the centre of the earth. Anon
- We were told that the bread crust is more healthy than the centre.— Arnon
- i used to think only children whose parents don't want them anymore goes to childcare centre.— Long long ago
- I thought it was impossible for anyone to lift more than their own body weight. Just seemed to make sense..— Xenomorph
- i used to believe the song "band on the run" was "band on the rug"— someone
- i thought in elton john's "tiny dancer'' the chorus was "hold me closer tony danza"— d.a.