Haha okay i'm super paranoid. Killing ladybugs=bad luck?

Are you serious????! I really hope you just felt like asking this and that you don't REALLY believe you'll fail the exam. The superstitions that appear to be true only happen by coincidence or because people MADE them true. Let's say you walk into your midterm feeling ultra nervous because you think you have back luck. You end up not doing very well because you were nervous, not because you had bad luck. Let's say you bring all kinds of luck charms to the midterm (I hope not!). You feel very lucky and confident. You end up doing well because you felt that way. Do you see what I mean?