Superglue in the dentures.
Sometimes, I find it insufferable to be friendly to overly guarded people. It feels like trying to hug a thorn tree. It feels like my efforts are futile. What's worse is when someone thinks my affection is like a chainsaw. I feel like people put teeth on me before they even meet me, and when they do meet me, I feel like there's superglue in the dentures. That gory image stays. I can't find people to get along with.