Don't worry, Joel. Men can't really tell if a female is a Lesbian either. Many times I checked out a really good lookin woman only to discover that nothing could ever happen.
Like someone already said, they have probably always looked at you. Unless you are wearing a sign, how can they tell if you are Gay? How to react? Just smile and think how all the heteros are envying you for having them eyeballing you.
Of course, you could always direct them my way.
If God's Spirit is filling a Kingdom Hall, how is it that Satan can manuever the ones within that Kingdom Hall at the same time?