People watching is super normal, as long as you aren't oggling/leering, but kinda watching people from afar or out of the corner of your eye.

The locking up thing though, I can see that making people uncomfortable. Is it compulsive or a conscious tactic? If the latter, maybe try to do it out of the way of your coworkers, if you can. If not, it depends how obvious it is. Maybe you could just say "sorry, sometimes I get dizzy?" if the action looks similar to a dizzy person steadying themselves? That's only if you get looks when it happens.

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