Yes, yes you are an idiot.

Look at the players stacks. You have to see that even if you are against a better hand (you are only worried about 2 possible hands, and there's only about a 1 in 15 chance someone holds one of them) even if you ae up against one of them, it won't hurt you that much.

You didn't just fold, you folded before Carniwar had a chance to react to the re-raise.