Friend-zone does exist, by some definitions, but not all definitions people use are correct, IMO.
Simplest way to put it is to say it is how you are `sorted`in someones mind. You are seen as someone who cannot be more than friends. This can be due to looks, personality, status, whatever. It is not a permanent state, where there is a will, there is a way. I have never been in this zone, but have mates who have either been stuck in it, or gotten out of it, even after years.
Here are some other terms:
Beta Orbiters:
Guys `stuck in the friendzone` who constantly hang around girls they have feelings for, in some kind of insincere relationship. They often try to defend he girl they orbit in a dishonest, jealous way to try and ward off anyone interested in relations with her.
I have often experienced something similar to this, especially when I go to a party a girl invites me to, and show up to find a group of dudes scowling at me the whole night every time I talk to the girl. Like please brahs, I am only here for the Tostito`s and salsa, leave me alone.
White-Knights:
People who constantly do favors, and go out of their way to suck up and please someone they like, in the hope that it will lead to sex and or a relationship. Nothing wrong with being nice or doing things for people, but if you do it for covert reasons and are not honest with the person, maybe there is something wrong there?
I remember a dude in school who would always give two girls money at lunch, in the hopes they would like him. Messed up on both parts.
Black-Knights:
People who have become bitter to relations with the opposite sex, and try to portray a phony `bad-boy or bad-girl`persona, because apparently, jerks always win, good-guys finish last.
Usually butt-hurt individuals attracted to PUA, and who go on and on about the opposite sex being such bad people.
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I don`t really label things or try to sort them like that, but given the right description I can say I have experienced many similar things / people.
IMO, there are a lot of people with low self-esteem and damaged egos who either don`t know better, or went down the wrong road. I try to follow the saying that `Human beings are inherently good`. There are just a lot of unfortunate people who end up doing manipulative, or dishonest things, as well as a lot of people who end up in an unfortunate place like the friendzone when they don`t want to be.
As long as you are as honest as you can be, and don`t live life always trying to get something out of other people, or feel entitlted, you should be fine. Some people are nice people and end up in the friendzone for no good reason, and they even feel like they can never express their feelings to those they care for.
Such is life.
Just my two cents.