Everyone, without exception, has found some things to not believe in. Things that are demonstrably true that we just don’t want to accept.
A bit like a fingerprint, each person’s pattern of disbelief is probably unique. You might believe that water is made of atoms, but that the moon is made of cheese. It’s hard to predict.
But the interesting question is: What has to happen for you to change your mind? What standard of proof, from what source, is sufficient for us to accept that something we’re sure wasn’t true, is true?
That’s a great place to begin.