Like Nhadala, I have Asperger's Syndrome.
I have esoteric knowledge on a number of subjects. My filter is patchy at best, and nonexistent at worst. The result: all the teachers at my school are aware that if I sound snarky, I'm usually just being brutally honest. I suck at expressing my emotions. I get stressed out over tiny details. When I joined my current school, I didn't speak to anyone in my class for two whole months. Thankfully, it didn't lead to bullying at my school, and I have good friends, so I have a social life of sorts.
ASD comes with a ton of sensory weirdness. I have migraines, prosopagnosia, Irlen and synaesthesia. I assume that you all know what migraines are. Prosopagnosia is face-blindness, so I can't recognise people out of context at all, or if I haven't seen them for a few months (when school starts again, awkwardness ensues). My Irlen Syndrome means that my vision is slightly distorted unless I'm wearing my glasses. My synaesthesia is probably the only one of those that isn't annoying, and is the one redeeming thing about my senses. Sounds are colourful, so listening to music is usually an enjoyable experience. It also makes it easier to recognise people due to vocal differences.
I am glad that I have it though. It meant that I could be weird and awkward. I'm also highly intelligent, so I didn't study much for the exams and I still aced them.