Is this a bad habit or or an illness?

[Amane]

Ok, so where ever I go and I see something on the ground or something I just have to know what it is, like at school I was sent to a different class for bad behavior, but after I left I kept coming back because i thought that I saw a brown spot then after I found out it was cardboard i turned around to leave and i thought i saw a shiny thing out of the corner of my eye and now I have an urge to go back... See what I mean stupid right? But it just bothers me everyday I walk past that certain classroom but it just bugs the crap out of me! I mean its like im gonna see it for the last time or something but i mean even if I was it doesnt concern me right? Oh and I also have a problem during conversations, like I hear what people say but when I dont hear them I'm always like wait what'd you say when it doesnt matter! And it gets so annoying like I have to hear exactly what they say like sometimes its just a grumble and sometimes its just so insignificant and stupid that they dont even remember!! I keep thinking to myself why do I do this? But I just dont know why, help please!