a habit that you wish you didn’t have

I don't like bad habits. When I realize something about myself that I don't like, I try to fix it. I used to be late to everything, but I made a point to get better, and now I'm pretty punctual. But for whatever reason, if there's nothing going on, nothing to think about, or nothing to act on, I get fidgety. So, for a long time, I picked at my fingernails. And then I tried to break the habit, but I still needed something to do with myself, so I developed the lip-biting habit. So now, I'll either bite my lip (which isn't terrible, but looks dumb) or I'll pick at my fingernails (if they're long enough) or when I realize I'm doing one of those, I'll find something more useful to occupy my attention.