I like to think of my subconscious mind as a little child. It gets scared or anxious easily. There are times when it thinks the situation is dangerous when it really isn't. But I can't tell it that. Instead, what I've realized over time is that I have to take that little child by the hand and gradually expose it to the danger to show it that it's actually okay.
This is known as graduated exposure therapy in Psychology. If you have a fear or anxiety that's taking control of your mind, you want to gradually expose your mind to the thing that causes it. For people who are afraidhave a great deal of anxiety with regards heights, for example, that means you start by looking at a ladder from 20 feet away. Then you approach the ladder, getting closer and closer to it. That might take several days. Over time, you start to realize it's okay, so you can get closer to that ladder without the feeling of dread. Finally, you reach the ladder and touch it. That might have taken you a month to be able to do. And so on, until you've been able to climb the ladder without the feeling of dread.