One important event was my introduction to the 'existence' question. A friends father pointed out that I couldnt know that he & my friend would still exist after I left their house. For a while I thought that maybe I could if, on the way home, I suddenly turned & ran back as quickly as possible to catch them unawares ...
The idea that the world might be a mere figment of my imagination upset me for some time. Two thoughts eventually kept me going
First, if I had invented the world it would be a much nicer place. And second, it was in any case the only world I knew, so I might just as well stop worriting about it
To be continued