This guy he always stands and watches me from behind or like I will be sitting in a chair and he stands behind my chair and try to shake it, why?

[Anonymous]

[DoggyDude]

Young men are often chaotic, particularly when they are in their late teens. Him shaking your chair sounds like he's looking for some kind of attention, as other people have commented this is typically childish behaviour, but may indicate they have some subconsious interest in you particularly (though what that is would be hard to know, as sometimes, sadly some people in school become the 'popular kid to bully'. I don't quite know why, maybe that kid makes it easier or reacts more, since all bullies are looking to get a rise out of their victims).

[RebelinSteel]

Yeah that’s not good. As mentioned, sounds like he has some issues.

[Nikki1989]

He is a child, or at least acts like one?

[Abbycado]

He’s has issues and immature.

[Iron_Man]

He likes you he just being friendly

[Luckycharms12]

Into you