Anything not considered "normal" is viewed as abnormal or insane. Having a trigger for a sudden personality change, insane. Having mood swings without any physical reason such as menstruation, insane. Locking one's self in a single solitary room to get work done, insane. So on and so on, literally and unfortunately. In order to be considered "normal" feels like the equivalent of needing a tail when around anything that has a tail. One can view self as "normal" but the public rather gather cattle and separate those that are not considered "ordinary" by terms of the average. If seventy out of eighty cattle have five legs, the few cattle with four will be ostracized either by natural selection of the herd or by the farmers.
On point: Trying to convince others that one is approachable, although strange, is similar to a child that obeys its mother about regarding strangers. Eventually, the subject stops reaching out and sits alone. The first to show an interest in the subject is rejected away by subject because subject has grown use to the silence and loneliness. The first sign of this would be the paranoia that the subject is convinced will keep it alive. It carries weapons on its person, materials and objects that are allowed within the area and permitted with everyday use but the subject sees more than one use in those objects. Sicks twisted devices begin to emerge from the depths of the mind into the physical world; wrought out of metal casings mixed with other materials. Subject happens to keep multiple that show progress; the first is a simple eraser with metal shoved through it, the second is the metal of the pencil eraser with nails shoved through in shuriken fashion, the third is sword like construct fashioned out of eraser and pencil shaver metal. No originality but subject is proving troublesome, recommend subject removal from school.