Hmmm... it's hard to say. I do a lot of odd little things.
Sometimes I "write" the last word I hear in the air with my finger over and over and over again. It helps me feel like I'm keeping up with the conversation to some extent... a little more secure when listening to things I'm not so much interested in, because I'm listening for that last word every time.
Sometimes I "write" numbers over and over in the air just so I don't forget them.
When excited about something, I tend to rock back and forth a lot. Like, if I'm watching a movie or something. It has replaced my less acceptable stim/excitement showing for the most part, but is still equally distracting to others it seems. I used to squeal a lot, clap my hands, and jump up and down. You'd think rocking would be better, but instead of knowing it's because I'm really enjoying something, people constantly ask me what is wrong when it starts up :S
I rock back and forth when stressed out... it is calming, soothing to some extent. Reminds me of rocking my kiddos to sleep, or being rocked to sleep, except, I'm not doing it to go to sleep, but to calm my mind essentially.
I pace a lot when talking on the phone... constantly actually-it helps me think, keeps me "active" in some way and it's easier for me to pay attention to what someone is saying. If I sit still I blank out and cannot listen.
I "type" in the air with my fingers when thinking, as well as rub my hands together, twist my fingers around, etc. I'm not sure why I do that in all honesty... that just sort of happens. Maybe another way of keeping myself "active" so that I can keep up with things, or it helps me think about stuff rather than spacing out at times? Especially when talking to someone important about something that I really NEED to talk about. Then it gets really really constant, so I'm assuming it keeps me involved in some weird way so that I can think things through and have a better shot at remembering to ask questions or whatnot instead of clamming up completely.
Then there are things I do... just to do them. I really have no clue why. Tapping my desk, chewing my lip, pulling my earlobes, wiggling my toes around, tapping my foot... it just seems in some way, shape or form, I am constantly moving. Sometimes it serves a purpose when uncomfortable, upset, stressed, or excited, and sometimes it just happens for no apparent reason.
There are also times when if I try to control it... it's not really "painful" in the sense of "ouch", but it's something I just NEED to do.
Regardless the reason though, everyone always thinks there is something wrong with me, lol, and feels a need to ask.
So I guess it impacts me positively in some way directly/personally, but negatively concerning how others see me and respond.
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Sorry about the incredibly long post...
"I enjoyed the meetings, too. It was like having friends." -Luna Lovegood