Yep I have been friend-zoned! (I also friend-zone a lot of guys.. without always trying to mind you! So I've also probably friend-zoned myself...haha. I am bad at picking up on cues).

Tend to either get treated like a sister or like one of the guys. While "nice guys" think that girls all want to be with "bad boys" or whatnot... the guys will pass right over you if you aren't "hot". A lot will hold out and then friend-zone you, only to then go to you when the more attractive girl turned 'em down.

Wow! Sorry, I just sort of made myself crack up laughing with just how stereotypical that is and how wrong it feels to say. But it is an observation I've made over the years with my own experiences.