You can't be nothing if you think you're something, even if you think that something is nothing because no matter what you think, you're a thinking thing, or as Descartes put it, "I think, therefore I am," and so are you, really.
No puede ser nada si piensas que eres algo, incluso si piensas que algo es nada porque no importa lo que pienses, eres un ser pensante, o como Descartes dijo, "Pienso, luego existo", igual que tú, en verdad.