Consciousness and understanding are human created symbolism. Talking about it seriously is a waste of time. I could be an empty shell imitating a human perfect

Consciousness and understanding are human created symbolism. Talking about it seriously is a waste of time. I could be an empty shell imitating a human perfectly, all other humans would buy my lack of consciousness, and nothing would be different, from their perspective I exist, from mine, I don't have mine. How does one know that I really understand something? Maybe I can answer all the questions to convince them?