i fidget with my fingers when i am trying to sleep, rubbing my thumb against my forefinger for example. i think i use my nails, but gently. half the time i don't know i'm doing it. when i realize it, i stop... until i forget.

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When I am standing..and somebody calls me on my mobile..I tend to walk around in circles or figure of eights...I didn't realise I did that..but I do it all the time apparently.
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Agnostic.com to both your questions.

I have OCD pretty bad, so I have a bunch of habits i would love to change.

Using computer games to avoid facing responsibility.

I have lots of bad habits but the one that irks me most is my impatient inability to let a person finish what they are saying before I interject my opinion or information. I try to control it but not always successful at it.

When I’m eating a meal, I always eat one thing at a time. Like - finish the vegetables (all the potatoes, then all the green beans, whatever), then start the meat. One of my friends pointed it out when we were in college, I had never noticed it before but now it makes me self-conscious when people notice!

Nail-biting I'd like to quit

I raise my pinky finger when I drink out of cups or bottles.

Eating late night snacks… in bed.

I count the letters in words. Been doing it since I was a young boy.