wishful thinking

noun2

1. •
   The formation of beliefs based on an outcome that aligns with one's desires or hopes, while disregarding evidence, rationality, or reality.

   • When you first come out, you might have an overactive gaydar. When I realized I was gay, I wanted everyone to be gay too, which led to a lot of wishful thinking. "Helen Hunt is gay!" Dream on, girl! — 1996
2. •
   Decision making based on self-delusion.