English is my mother tongue, too.
In some respects it's a good thing - English is a world language (a macro-language, as linguists call it), and the language of the internet.
But in other ways, it's not that good - ethnic English people (myself included) tend to be crap at learning other languages. The fact that English is a world language has made us lazy.
As Ricky Gervais has said:
"You don't need to speak French in France. If you're on holiday in France, speak English. If they can't understand you, try speaking louder. If that doesn't work, just smash the place up, secure in the knowledge that you've tried your best!" XD
But seriously, we English are often lazy when it comes to learning foreign languages.
Not everyone fits this stereotype - my aunt's partner is a Londoner who went and lived in France for over 20 years. He learnt the language and is totally fluent. In fact, he has a daughter with his ex-wife (who's French), and his daughter lives in France and speaks only French. She speaks some English but only as much as the average French person - her English dad didn't bother making her bilingual.