Epiphenomenalism:

One of philosophy’s most disturbing ideas

One of philosophy’s most disturbing ideas‘What if you don’t matter? What if all of your thoughts, precious feelings, great dreams, and terrible fears are completely, utterly, spectacularly irrelevant? Might it be that all of your mental life is just some pointless spectator, looking on as your body does the important stuff of keeping you alive and running about? What actually is the point of a thought?…’ Jonny Thomson via Big Think