There has always been someone predicting the end of the world since there have been people. For example:

The Cold War- ~1947-1991. The major concern was nuclear war followed by nuclear winter. Virtually everyone was predicted to die. As an elementary student in the 1960s we had regular "Duck and Cover" drills. Hell, I grew up in the '60s and '70s in upstate NY, 20 miles from a major US Air Force SAC base, a major target. We didn't really focus on this all that much, we weren't all cowering in fear, we just lived life. Looking back, that should have been some seriously scary shit!

In the 1970s there were all sorts of predictions, pollution will krill us all, an Ice Age was coming, etc.

Y2K was supposed to be a major problem in 2000. Planes would crash, Wall Street would crash, power would go out, nuclear reactors would melt down, etc. What a major fizzle that turned out to be!

The current "Climate Change" scare started out as "Global Warming", the name got changed when the global warming wasn't happening as fast as it was predicted. Guess what? Climate changes!! Take a look at Al Gore's "An Inconvenient Truth", the documentary that essentially started the whole Global Warming craze, The predictions were much less than accurate.

I could write pages about failed doomsday predictions but there's really no point, there will always be someone predicting the end of the world. Always!!!

Economy? There have been great times and there have been bad times. It is extremely doubtful that you'll see a total collapse. There could be a market crash, it's happened before but at your age, it'll have little effect. Me, at 61 years old would be pissed since I'd lose a lot of my retirement money in my 401K but it still wouldn't be the end of the world for me.

AI? AI has a long way to go before it will ever go mainstream, if ever. Yeah, the current versions can do some amazing things but most of them are very specialized and cannot do the things humans can do as well as humans do. Yep, they will take some jobs from us, you don't really need a human doing repetitive job on some assembly line. Humans are still king and always will be at creative endeavors.

You could go the Prepper route if you're unable to let go of your fears but it could get expensive.

There's always going to be something to worry about in the future if you focus on it. Life your life in the here and now, don't live your life in fear. Plan for the future for sure but plan for a normal life.