Are you more open minded or more close minded?
Depends on the subject.
Depends on the topic. If I've done extensive research on something and have formed an opinion based on that research, it's unlikely my opinion is going to change without an equivalent amount of data in the other direction. If I haven't extensively researched something, I'm open to learning about it.
Open minded to the extreme!
Do people admit to being closed minded? Do they even realize?
I don't think so. Any view they might have is closed to input to the contrary. They therefore believe it to be true. If it's true why accept input to the contrary? That input has to be wrong.