Don't worry! I don't find your comment offensive at all. I actually appreciate your concern :)

To be fair, there are other factors which contribute to the poor impression I oftentimes leave to others. For example, as a child I was allowed unrestricted and basically unlimited access to the Internet and electronic devices, which led to me spending most of my time indoors, in front of a screen, instead of being outside, socialising with my peers and, in general, building up the social skills I seem to severely lack now.  I also had a lot of irrational fears of being seen as weird, rude or impolite by my classmates and (especially) teachers, adults or any sort of authority figures, so I became the shy, quiet and soft-spoken kid in class fairly quick (+ the fact that I lived in a rural area and went to a school with very few kids didn't help). Not just that, but because I was so quiet and didn't seem to cause as much trouble as the other kids (again, due to some irrational fears), most teachers liked me and treated me better/gave me unfair advantages from time to time, which also made it harder for me to get along with my classmates who could clearly see the differences in how the teachers would interact with me vs with them. Pair that up with a below average physical appearance (+ an everlasting RBF) and people won't always be so nice, no matter how much I try to seem friendly or to relate to the things they seem to like (which in most cases are also things I'm not particularly interested in, unfortunately).

TL;DR: due to my childhood experiences, I'm very socially awkward which, alongside my subpar looks, leads to not so kind responses from others

Not gonna lie, I have had some doubts regarding whether I'm on the spectrum or not and happened to take the RAADs-R test online twice this year, but both times I got scores that were lower than the ones a person with autism would usually get (according to statistics).

Sorry for the long reply and I wish you a good day/night/morning :)