How normal is it to not look at anyones face in public situations?

Whenever I’m in public or walking around I tend not to look at anyones face if there’s no form of communication going on. I look everywhere else but peoples faces even in a classroom setting. I know a lot of people are more observant and look around, but I get anxious and not look at all because I fear people will think I’m watching them? How would this look in another person’s view?
How normal is it to not look at anyones face in public situations?
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