This is an easy opinion to harbor when you speak a language whose future is pretty much secure.
Imagine if you woke up one day and you were the last person who knew a word of English. All the English-language music you've ever heard, all the books and movies, etc., are now totally incomprehensible to everyone you'll ever meet. All copies of them, and indeed, all English text except for whatever's in your pockets, is gone. All the place names you know are removed from the map. All English words borrowed by other languages are gone. Every native English speaker (aside from you) has disappeared, and their very names are unpronounceable to the world's remaining population. Maybe even the Latin alphabet is gone.
You get to keep all your memories, but naturally nobody shares them or has reason to believe they actually happened. Most people don't care to hear about them. If they do, they see them as a curiosity, a museum piece to be put in a display case, not something with the slightest relevance to their own lives.
You can't even tell English-language jokes anymore. They aren't funny in translation.
Of course this leaves you isolated. And of course there's a solution anyone can offer you: Forget about English. Adopt a whole new life where you're a normal person who speaks a normal language that other normal people understand. Your identity as an English speaker is entertaining for about five minutes, but ultimately an inconvenience to society. Hurry up and let it go.
If this sounds harsher than what you were trying to say, perhaps you've underestimated what a language is to the people who speak it. It's more than just a list of words.