End of the world anxieties

So it may sound so silly , but I’m 15 and still get absolutely terrified when someone says ‘the world will end soon’ blah blah. I just need support and people to tell me that it won’t. As my anxieties get absolutely horrific about this subject. When I was back in primary , 2012 , the rumour going around that the world would end was the main topic in my school. And I DID NOT want to go. I had to sit in the office and talk with the teachers because my anxieties were so bad. And they are still REALLY bad now. So please, ANYONE HELP!! ☹️☹️