Of course I've changed my mind. However, that wasn't a decision I made but it happened because I was confronted with new evidence or because I reexamined what I already knew. But then I couldn't just change my mind back. The new evidence convinced me and without any additional evidence to the contrary I can't simply decide to be not convinced anymore. Or are you able to convince yourself that something is true and in the next moment that it is not, then again that it is true and so on without seeing any new evidence or reexamining the information you already have? I for instance can't convince myself that the moon is made of green cheese, or can you?
This is the belief I am talking about and not the belief that can be also referred to as trust like in: I believe my father that the car is in the garage. I don't have any evidence that the car is there but since I know from experience that my father doesn't lie to me in such a case I trust him when he tells me that the car is in the garage.
because I was confronted with new evidence You made a choice to believe the new evidence. You chose your belief.
Is to want volitional? Is emotion volitional?