Socialisation after a long hiatus from interacting with the world is a unique experience. It does put fear into perspective. Just the idea of a conversation is terrifying. On the other hand, you do get a rush from it. A conversation feels like doing a scary physical activity with negative consequences.
The hardest thing to overcome is your own imagination. It tries to construct worst-case scenarios that aren’t even possible. To be able to imagine all that and still proceed to leave the hermitage gives one a sense of accomplishment. A sense of accomplishment for what most of the population achieves without thinking twice.
It is a crippling state of mind, but the knowledge of it being so does not help. Only lining up the seemingly petty accomplishments reduces the nerves somewhat.
You tend to feel like a performer who needs to tackle stage fright. I don’t have stage fright, but conversations with people, especially if I want something in a practical situation at some service operated by people, are terrifying.