I meant to include this in my initial comment but i accidentally hit send (and im not tech savvy enough to fix it)
Some of my experiences:
-back in my schooling days, when i would arrive at school i would hide in the bathrooms until the opening bell went (i never actually needed to use the toilets, i just hid in the stalls).
-also from my schooling days, whenever you had those moments in class where you were allowed to talk to your friends (if you know what i mean), nobody would talk to me so i would just pretend i was fixing my pen.
-since ive finished school ive been so lonely that i have started making random google spreadsheets and filling them with random data to pass my time at home.
-recently when i caught a taxi to a fast food restaurant, the taxi driver asked what i was planning to do and i told him that i was meeting a friend there (i have no friends) and i ordered my food and ate alone at my table as i pretended to browse on my phone.
-i tend to fantasies about what it would be like to be friends with a particular person ive seen in real life but havent really interacted with, knowing full well i will never actually approach them.
There's probably many more that im forgetting.