Much as I am able to rationalise the idea that "not everyone will like you", I feel it's a bit more complex than that.
If someone that's present in my sphere doesn't like me or has an issue with me, especially if it's someone I care about upsetting, it goes beyond "oh, they don't like me". It becomes "are they going to get revenge/try and destroy me?".
I also find myself struggling with my friends too. It's nothing that they've done wrong, it's entirely my own problem, but I go through phases of questioning if they like me. I fear that they're going to abandon me and occasionally I might want some reassurance but I wouldn't know how to go about it in the best way - I obviously wouldn't ask every day but sometimes I may feel like I need it.