Do you guys ever feel like you're being watched

Everyday I go walk around outside my school I feel like someone's tailing me specially at night. Call me paranoid but it feels so weird, I don't have this feeling when I'm inside but any part of where I'm outside I feel it but there's nobody behind me nor anybody I notice similar every time. It's either my stalker is incredibly good at hiding and disguising the self or I don't have one but if I don't have one, why do I get this feeling? My friends say they feel it sometimes too but just who in the world would do that? I don't have a boyfriend because I have a fiance, it's an arranged marriage from my parents. It can't be him because he and I haven't even met yet. He doesn't know what I look like. Why would they even stalk me so much? I don't do anything interesting in my life. I'm introverted.