I also twirl my hair and will run it through my lips if I"m thinking really hard. Used to do this a lot more in high school and college when I had tests.
I have a few of these. I used to bite my nails, but I wanted nice long nails so I broke the habit... aaaaaand now I pick my cuticles instead. I also pick at pretty much anything with skin hanging off - scabs, pimples, etc. I grind my teeth at night; I've done that my whole life. My teeth are really worn in places, and I keep asking my dentist about getting some kind of night guard, and he keeps saying, well, we'll keep an eye on it and see if it gets worse. It's worse every time, and he still doesn't give me a night guard!
New dentist ASAP. Google pictures of people who have been grinding their teeth for years, all that's left are these gross little stumps! :shudders:
I have a night guard for grinding and it is amazing. I also wear it on long road trips if I'm by myself.