I feel very uncomfortable when people stare at me, it makes me feel nervous, so very early in my poker career (it's not a career, its just my hobby), I used to wear sunglasses at the table... I guess I thought it was "cool" to wear them and it took away a lot of my nervousness.
But I quickly realized there is a big flaw when you wear sunglasses... the problem is, you can EASILY mis-read your own hand!! It's very dark when you peek at your cards, and the sunglasses makes it even worse. So it wasn't very long before I gave up wearing them indoors, now I just think it is dumb to wear them... and I just deal with feeling uncomfortable when I get stared down by an opponent. Over the years, this feeling has gotten better, it no longer bothers me too much. I think stare-downs are overrated anyway, you can play an entire poker tournament and never bother to look at your opponent, it really isn't necessary and I think the whole idea of "tells" is highly overrated. I have never once changed my decision based upon something I see my opponent doing, in fact, if they are doing something weird (such as acting nervous or acting disinterested in the hand) they are most likely doing it as a bluff... it is a technique called "doing the opposite". If they have a monster, they try to appear nervous or pretend they don't care about the outcome... so long ago I stopped trying to "read" my opponent's body language, and I feel comfortable that they can't ever read mine either, I am able to use the same motions no matter what hand I have, a monster or a bluff. I just develop a routine and I stick to it, and the longer I play this game, the less nervous I get at the tables.