Out Of My Depth

I have no idea how I'm supposed to win at NL100 when villains are capable of doing things like this. I have this guy drawing dead and he is somehow able to make this sick bluff and show me As4s after I fold and show my AA. How can he possibly do this? Does my range really look that weak after I barrel on that terrifying turn? Am I giving him too much credit after he checkraises that terrifying turn? What the fuck?

Part of me thinks that I need to more aware of spots where I can do this to people on superscary cards, but part of me thinks that nobody else at NL100 on Cake will make the fold I made. Short of taking meticulous notes on every hand I see every villain play and doing deep analysis to figure out who of them is capable of folding, I don't see what I can do about this.

I really hope this guy is just a fish who stumbled upon an incredibly sick play but I can't shake the feeling that IT IS I WHO AM THE FISH...