If you say that personal anecdotes are welcome and you seek emotional self-reliance, I have something to share I guess.
Adults can have immersive imaginary companions in a similar way that children sometimes do.
If you spend time on interacting with an imaginary character, two qualities can emerge from this:
- you learn how to think from perspective of this character without putting effort into that. This makes the experience of imaginary companions "talking back" to people.
- you cultivate a relationship with that character that's like relationship with other people.
There are some internet communities practicing it. You might have heard about tulpas, soulbonds or daemons. Some kids and some writers experience it too, some scientific research mentions "illusion of independent agency".
I have been practicing it myself for over a decade and can say that I believe that it had a positive impact overall and only positive impact after I unlearned popular tulpamancy and started approaching my inner relationships with more dialectical-materialist mindset.