To be honest, it's not worth the effort to learn a whole new language and give up on English. Learning a language past 20 years of age is incredibly difficult.
You wouldn't be giving up on English. And kids learn languages much easier, but learning a new language if you have to deal with it everyday isn't that hard. Then, most people there know some English anyway, making the process easier.
In my time there I came across hardly anyone who spoke English. French is the most common second language. Maybe I wasn't hanging out in the right places. It's a pretty easy language to learn.