Literally no one is saying anything remotely like that.
Pointing out it paranoid to think a couple of strangers having a chat are likely not talking about YOU is not remotely the same as personal insults.
People need to remember while they are the star of their own narrative they are usually barely more than a background character in a strangers story. No one hates others and is having whole conversations over a mam they haven't even bloody met because strangers are not the center of their universe.
They will be chatting about their OWN lives and maybe if they are 'gossipy' type then that of people they actually know (family, friends, friends or friends, coworkers) not randomers they have never spoke too before.
As for looks, we have eyes... we have to look SOMEWHERE multiple times a day. Why do women (and it almost always is women against other women for some reason) assume that a passing glance is an attack. Why do people read into how long someone looks in their general direction? (too quick they're avoiding me, too long they're staring... or maybe their eyes just exist and you are in that direction).
The person likely looked up for a second, probably not smiling because they are not a permanent painted Cheshire cat grinning away like a loon but its not an assault on anyones ancestors.
That's what makes logical sense to any non paranoid person... OP has given ZERO reason as to why strangers who she has known for less than 3 weeks would hate and obsess on her. Horseys not zebras.