>>11241271Exposure and desensitization.
The limbic system is the seat of your primitive emotional states, anxiety for example, and can't really be logically reasoned out of even the most irrational fear. The only thing it responds to in the long term is direct experience and environmental cues.
So you have to use the short term control you're capable of with the rational reasoning systems of your brain to expose yourself to the things that make you anxious, until the primitive parts understand there's no danger.
Go slow so that you can actually sustain growth, most of your 20s are meaningless anyways.