Learning another language is difficult, but never occured to me to think it would be somehow impossible to anyone. It might be that having english as your native language puts you in a uniquely difficult position as it is the default international language. World is getting smaller and people coming from smaller languages usually also learn the local international language as well. If you are born to family speaking estonian today you probably pick up also english or otherwise you spend your life surfing only estonian websites. It requires no special talent (although some people are fast at picking up new languages)
I don’t know where you’re from, but if you’re European (it sounds like it?), you probably take for granted the head start you get by knowing multiple languages from childhood. Every European I meet has a comfort with language learning that I can only approximate with great effort.
I agree with you about the disadvantage of being a native English speaker, but mostly I think the real disadvantage is being an American, and never having a reason to learn another language (though that has changed in my lifetime with Spanish, and possibly Mandarin).
In any case, a lot of academic researchers claim that it’s impossible to learn a language to a native level as an adult, which may be true, but that claim has been twisted into “impossible to learn a second language” by a lot of others.
> It might be that having english as your native language puts you in a uniquely difficult position
Personally I suspect English has some great advantages. The main disadvantage is defaulting to superiority.
The natural disconnect between written and spoken English is tremendously helpful. Well educated English encourages copying sounds - pronouncing foreign names and places correctly. This is a huge leg up compared against some other cultures. Think sports stars having their foreign names pronounced correctly. People often know how to try and say Paris or Barcelona correctly. We naturally know that how something is spoken trumps how it is written.
English speakers often have the ability to hear sounds because there's so many wildly different English accents. Especially vowels (we natively use a wide range of vowel sounds). There are sounds English speakers struggle to hear, but I think we have an advantage over some other languages.
If you're the type of person that attempts to mimic accents, then you've often learnt how to say a huge range of vowels and consonants. And how to stretch them (Strine, some US accents) or shorten them.