Maybe make the decision to not to let others live in your head today. You make your head full of your happy thoughts.
That's a good trick too. When you start feeling that you're being "mean" or that people are being gross to you or whatever, reflect a moment on something you like. Ideally something you like doing.
I have no idea what those moon units mean, but the comparison to a chihuhua I get. So I might be bigger than you. 😄 (160cm, 55kg.) But I get the whole demeanour thing. That's what Dad tried to instill into me (with shaky initial results but I'm much better at that iron stare now).
I get that the aro/ace thing likely disorients you more. I just wanted you to be aware it isn't just you. Almost ALL women find being hit on while trying to do their job disruptive, creepy, and really irritating. You're not alone and you've got people who can at the very least empathize. And there's not much you can do unfortunately without risking losing your job. You have to say "no" firmly. Draw the line. Make sure you call out any line crossing. And if they don't get the message, pull out your 鸳鸯钺¹. That usually gets their attention (and you'll be able to leave your job almost immediately! 😉).
¹ These things.