Hi James,
I thought so. This is a habitual belief adopted by you from your dead father, you can recognize it as being unproductive and decline to believe in it any longer.
Because it has become a habit it requires your attentiveness to decline it as soon as it makes its appearance and replace it with a habitual confidence that you can, and have already done so a few times.
Changing yourself does involve a bit of effort but it is well worth it.
Cheers Vineeto