At a table it is not necessary to pretend, because the regular player is going to play 20 hands with you and will realize if you are a regular, or you are a recreational player, or you are an even worse fish.
For example, if you enter a table and instead of doing Open Raise which is what any regular player does, you limp for example with AA in UTG, the regular player is going to test you second, he will make you a ROLE at 5 BB and depending on your reaction he will see if you are a fish or if you are a tight or if you are a regular who pretends.
As my brother
@A kiravio says, a strong or good hand, by wanting to pretend or act badly you can lose a lot of money or even an important tournament.
For example, this situation really happens a lot when a player hits a set on the flop, and depending on the flop he only calls or even checks until the river to see if he can catch you, he does not realize that the other player is getting the entire information that the turn or the river has, and that can even give you a better game than the set that the one who wants to catch you has.
In poker, every bad decision makes you lose money, always keep this in mind.
Greetings

