There can be many reasons for that; it may just be a coincidence that people follow you, and nothing is really happening; perhaps you owe somebody money; somebody is investigating you for some other reason; somebody wants to do you actual harm; etc.
A good idea
No, it is not an oxymoron. Strangers are not classified as people who are "seen", so being unseen does not contradict the overall meaning.
Stranger anxiety is when you are afraid of talking to strangers and being around people that you don't know because they are strangers and they frighten you.
the strangers
Company of Strangers - Company of Strangers album - was created in 1992.
yeah why?
Make three consecutive right turns. If they make those turns with you, you're being followed.
A full of strangers
Being unduly fearful or contemptuous of anything foreign, especially of strangers or foreign peoples.
There is no specific collective noun for strangers, in which case a noun suitable for the situation is used, for example a family of strangers, a neighborhood of strangers, a congregation of strangers, etc.
The word "strangers'" is plural possessive, indicating something that belongs to multiple strangers.
The plural possessive form of "strangers" is "strangers'." For example, "The strangers' cars were parked outside."