Best psychological thriller/ movie that will make me uncomfortable without being “horror”

Couldn’t figure out exactly how to word the title. I really like movies but for some reason I rarely watch them. Horror movies are my favorite but I want to expand on that a little more. I love an uncanny valley feeling. Something that makes me uneasy without being overtly horrifying. Also loveeee a liminal space/backrooms kind of thing too. Basically I just want to feel unsettled and confused

Edit for additional clarity: I LOVED Vivarium and Shutter Island. Also enjoyed Im Thinking of Ending Things. The concept of being stuck in a small space with another person while the anxiety builds around the characters always does it for me in movies. That’s my personal hell but I love to watch it.