Why do i have ninja-like traits?

Ok, Im a guy who stayed at the same school since grade 1, past grades I was always I quiet person. And because of that I am used too and enjoy silence, because it makes me feel fantastic and awesome. Beside this, people have a tendency of forgetting things about me, like a month ago my classmate in business studies asked me if I TOOK the subject(keep in mind the classes have been going on for 4 months! Starting from september) and when my other classmates heard this they were also surprised. I mean I sit in that class 2 times a week, sometimes I even present up front and they did not know or forgot I take business. I also have this habit of mine to stare alot and by alot I mean ALOT, I do this to people I feel being worth of a stare and try to peer into their souls. And another ability I got recently is to wander around aimlessly, bumping/going through small random groups of people only getting noticed by up to 1-3 classmates of mine outside the group. And while wandering around aimelessely in the track and field during recess I even dodge trails of children/teens running by naturally, meaning that I don't even need to change course to pass. Fortunately I got 2 bestfriends who notice me(most of times) and one of them envies my capabilities. I even remember this cocky time of mine when I was just spectating a friendly fight up close(As close as those documentaries but closer)I was in that wander stance, just like in reccess. This just does not happen in real-life only. It even happened during group chats several times, I just pop out of nowhere, say a random thing or share my opinion and majority of the time they don't notice me, just that envious classmate. And the only way to make sure they notice me is to attach pictures along my messages. Tell me, is this normal and that one of you is experiencing a similar experience? Or it is not?
I forgot to mention I also kind of abuse this power sometimes, to see if it will run out or something. Now I feel that if I knew how to pickpocket, I would never get caught doing so. I also have this habit to creep right behind people and stare in their neck hairs, just the neck, or head. And I also stare seriously(like I mean business) at random people just passing by, I even use head movements to intensify. That makes me feel like a robot.