Question from a young investor

Hey everyone! I am currently trying to get more seriously into investing, but I am constantly second guessing myself due to all the doomer posts on Reddit. “\~35% from S&P 500 is AI. The bubble will burst”, “ new investors are gonna learn a very harsh lesson that old investors have known for a long time”, “when the bubble pops, a lot of people will lose a lot of money”, etc. I never really got into other types of investing, crypto for example, and I am quite frankly happy about that, given its current state. But the thing is that right now everything seems like a bad investment idea. I know people who put almost all of their savings and pension funds into S&P, but those are the same people that were paddling crypto currencies to me that fell 90%. So, with all the negativity lately, how does not choose what to invest in when nothing really seems like a good idea to me? Apologies for the rant and thank you very much for your help and advice in advance!