If everything I say is a lie, am I telling the truth?

Liar paradox. In philosophy and logic, the classical liar paradox or liar's paradox is the statement of a liar who states that they are lying: For instance, declaring that "Iam lying" or "everything I say is false". If they are indeed lying, they are telling the truth, which means they are lying.

Liar paradox - Wikipedia, the free encyclopedia

Rooster has given the correct answer but I'd like to point out the danger of asking this type of question.

But take warning: The liar paradox can lead you to share the extinction of the do-do bird who flew in ever diminishing circles until it disappeared up its own whatsis.