“Everyone around me thinks so” explains where a belief came from. It isn’t a reason it’s true.

Agreement among people who talk to each other is weak evidence. A shared view inside a group tells you about the group, since you all read the same things and reinforce each other, and the same consensus would form around a wrong belief just as comfortably. Where an idea came from is history, not support.

Take one thing you are confident about and find the best argument against it, written by somebody who means it. Not the weakest version, the strongest. If your belief survives that, it is now yours rather than borrowed.