This has been an interesting thought I've had lately, that the things you know, the truth, can be far separated from the things you feel. Like sometimes the two don't go hand and hand even though they exist simultaneously in the same body.
For me, I'm so used to stuffing down issues so that I don't have to think about them. But the issue with this lies in the fact that while I know the truth and think that I'm walking in it, I can still be reacting from how I feel. It just takes something that may trigger it without my knowledge for me to act upon my instincts, so to speak, instead of walking from a place of truth, even when I know the truth.
An example I can think of this is a dog. He may be well trained. He may be a good dog. But out of the blue one day he attacks someone for some unknown reason. He knows better. In that moment though, he can't separate the things he's learned, the things he knows, from the way he feels.
We can all be like this. Can't identify the truth because we are running on feeling. Anxiety dwells in places like this. Anxiety can be well hidden until it isn't. Anxiety can cover the truth and cause reactions that surprise even ourselves.
So how do we change this? Allow healing in those inner most parts. Ask God to begin to reveal to you the areas that cause the responses, and then begin looking up Bible verses to combat those feelings. The truths in the Bible bring healing. And ask God to do His good work in those areas as hard as that may feel and as much as that seems that it may hurt, I promise, it'll be worth it.
The Holy Spirit is so gentle, and He'll work with you at a pace that will not harm you, but will bring you blessing and freedom.
Pursue that freedom!!