Amazingly native English speakers the world over seem to have this genetic predisposition! All of us just can’t seem to get it together when it comes to becoming multilingual.
OR… maybe it comes from being born into mastery of the language everyone else on earth is trying to learn. I get three words in Spanish out before my conversation partner asks to switch to English. What am I gonna do? Stamp my feet and demand I get to practice my hobby and deny them the opportunity to work on a valuable career skill. Nah. We’ll speak in English.
Your ancestors (assuming you are British) created a global language hegemony. My ancestors moved from southern Italy to the US and learned their language.