Sure, I don't mind. Wouldn't we all like to know examples as to where we're going wrong?
Take all this as just my view on what i see from one random video, and this is just my interpretation of how i perceive the world and people i see in them, of course other people will have different opinions. i'm also sure that you behave differently when you actually have a live human being having conversation with you and not just staying and talking to a camera.
From just this video i can see that, when you think about stuff, you sometimes do just become ultra quiet and stare in one place, which can look weird, because most people just kinda widget and look around, smile, do grimaces trying to remember, do a lot of those "ughhh" or "hmmm" or "errr". You just do it with this very serious face (which is probably just your normal resting face), so you can look angry or disapproving to some. Even on your avatar here you look scowling to me because of your eyebrows.
And you also don't move your eyebrows and eyes much in the video, and i myself read a lot of info from person's face by the way they move eyebrows and where they move their eyes, so when you just don't do that it removes a layer of my understanding and imagining how and what you're thinking at the moment. You did wiggle your eyebrows in the end of the video, but it looked to me like you did that intentionally, not just like it's a part of what you were saying (most of us move eyebrows unintentionally).
It isn't strange to me that you don't look in the eyes (camera), but here you do look in the eyes sometimes for just a moment, then you immediately look away, which can make people think that you're scared of them (which immediately makes some people feel power over you, like huh this dude is intimidated by me, it means i'm better in some way so i better start actually behaving like that), are lying (which doesn't make my sense to me cause a lot of people can look you in the eyes and lie, yet for some reason it's this common thing to think that if someone isn't looking in your eyes while saying something important it means they're lying) or are uncomfortable about something. It would feel more natural to me if you looked in my eyes for lets say 5-10 seconds, while telling something ultra important, and then looking away again, what "trips me off" is that you just do it pretty fast.
Also in the start of the video you very visibly swallowed, it looks like you put effort in it and that you're very uncomfortable or nervous, because this is how nervous characters are shown in cartoons - they swallow (they also grin, whistle etc, but that isn't the point).
All in all, if i met you irl and you never told me before you're autistic and behaved ike that - i would feel strange at some moments, but definitely not repulsed, plus the more time i would spend around you the better i would start understanding why are you doing things a bit differently.
Another thing is that i dont see your posture and hand movements here, and they also mean A LOT when you have a dialogue with someone.
And I can't say anything "wrong" about the song video, i don't hear very good what you're singing cause english isn't my native and your guitar is loud, but all you did there looked normal