Yes, those sound like stims. (I saw what you wrote above about NLD, by the way! I will answer you up there!) The thing about stims is that everyone stims. I once read something an autie wrote pointing out that dancing is stimming, LOL. The difference may be that in the case of stimming, sometimes the person can't stop or feels extremely uncomfortable stopping; usually, an NT doesn't feel very uncomfortable being made to stop dancing.
Many people hum to themselves, or love to swing on swings, or twirl their hair, or bite their nails; sometimes they're quite intent on it and can't or don't like to stop, in fact, and these are NTs, so stimming in and of itself is nothing weird. In the non-NT world it's nothing weird either, it may just be more concentrated, last longer, feel more "necessary" and/or look less socially acceptable.
If you have NLD you might have stims and they might or might not be as "showy" as AS or ASD stims but the likelihood is on "less" rather than "more"...I think. I'm way new to the whole NLD thing.
But yeah. I vote: your actions are stims. I don't feel you need to do them less in public. Why should you? I mean if your stim were to beat people over the heads with a baseball bat b/c the vibration was awesome, yeah, you'd wanna tone that one down a hair. (joke...)But these? They seem very non-intrusive to me...plus, sometimes, the more you try to tamp down a stim, the worse you really want to do it and the more anxious you can get.