I often watch poker videos on YouTube where the player have very good acting to hiding his cards through his flat face. I have seen them being able to win with very bad cards on their hand with a good bluff, all in his chips. So I imagine, and often play poker online, I am very happy if I get a good card and I can't hide it well so just go all in all my chips. So what do you think?, how do other players know when I have good cards when playing online?, Is by check and don't call the bet they know we don't have a good card?, I'm not good at hiding it, sometime when I have double AS, I always all in at the beginning.
There's no way you will know your opponent's card, even if it means that they go all in suddenly after a few checks and a couple of cards on the deck. Some people are good at being unpredictable, those are the people who played poker their whole life. Some people are predictable after several rounds.
People like you, I presume a predictable one because you can't hold your emotions when you have good cards. Veterans can go all in even if the cards in their hand and on the deck doesn't make sense, just to bluff and scare those mediocre players.
That, is the beauty of the poker compared to other gambling games. Poker is more than just gambling, it's a psychological warfare.