Advice Needed - Awkward Stares

I’d love to get everyone’s take on this situation, since I know we’ve all dealt with it. 

I was wondering how you would recommend dealing with guys who stare right at your boobs. I’m 14, and I had that done to be for the first time the other day, and I felt so vulnerable and mortified. It was a public place (Doctor’s waiting room) so I couldn’t exactly scream EYES UP HERE BUD. I was just wondering what’s a good, discrete way to say NO.

Thanks to the fact that I have crazy eyes, my death glares usually do the trick but I still feel compelled to change how I’m sitting. It’s incredibly frustrating, as you all know, to have to move from a comfortable position because one creep feels entitled to stare.

How do you guys all handle this situation? (expand notes for responses)