56s plays better in a multiway pot than ATo, but you have ATo here. You are looking to flop huge here, and if you don't, you have to be able to get away from your hand. If hitting anything will make you lose a ton of bets, then folding preflop might actually be correct. But you will eventually have to learn how to play better postflop. If I hit an A or T, I'm going to have to pay attention to what my opponent does.