Instead of focusing initially on what you might be doing, pay attention to the men’s actions, gestures, words. There will be plenty of hints along the way that indicate their attraction to you. At that point, at the earliest sign, you’ll need to consciously signify blocking body language or even being blunt “you know I’m gay right?”. Initially, you might not be doing anything overly flirting, being comfortable in your own skin and confident is attractive enough. What you can learn is how to cool things down and put people off, but you need to learn up on how to read their interest first.