I certainly agree that English is the most widely spoken language and this certainly make it difficult for us to learn other languages. It means that, when we travel with other English-speakers, we have to use English all the time “out of politeness”. I have found that the only way to get conversational practice in other languages is to travel alone.
The second half of your response uses some very imprecise and unscientific vocabulary. English is no less structured than other languages. A language without grammatical structure would not be able to convey meaning with any clarity. In other words, it would be incomprehensible. I can only assume that you are trying to say that most other languages have a more elaborate morphology than English. I certainly agree that it is difficult for a speaker of an analytical language such as English to learn a more synthetic language such as Russian but the converse is also true. Our language is neither less structured nor more opaque than any other language. If some of us are capable of learning other languages, then why are not other English speakers able to achieve the same level of language skills?
Your assertion that we fail to learn other languages evades the issue in hand. It is certainly hard to find a place, where English is not spoken. That is the legacy of conquest and colonization. What happened hundreds of years ago affects the lives, cultures and languages of people today. On average a language dies out about once every 12 days. These languages die as a result of the languages of colonists and as a result of the expectation that things should be done our way and in our language. And it does just fuel the attitude that we expect other people to speak our language and express their experiences in our terms. This is one of the ways, in which we have been led to assume that things should be done according to our cultural values and norms.