Friend zone

I've had a weird number of male friends who have liked me, and I'm not sure why, because I'm one of the most boyish girls I know. Like I walk into a resurant and I the waiter asks me "what would like today, sir?" about 90% of the time. If I was trans I would pass pretty well.

The issue is that most of the time I can't tell if a guy likes me. I'm usually really concious of women liking me, but for some reason it's not as obvious to me with guys most of the time. I want to know how to friend zone them before anything happens, because it's made some of my good friendships awkward before and I don't like having to reject my friends either.