What films you find relatable or have themes of social withdrawal?

(I rarely watch anything and forgot much of the details)

psychological themes/horror:

Marebito (man obsessed with fear),

Maniac from 1980 (serial killer >!substitutes mannequins for humans!<),

Elling (title character is taken to an institution after his mother dies, tries to integrate into society),

Suicide Room (hiki/school),

Psychometry from 2013 (detective film, more action-oriented than the others)

also saved this to my youtube watchlist (my focus is on the ocean floor level so it keeps growing): https://www.reddit.com/r/hikikomori/comments/1uhqa9k/an_old_hiki_movie/

forgot some of the most important