Being nice to a girl doesn't mean they owe you sex, and if that's all you want from them then your not the "nice guy" your in fact a "Jerk"
The girl/boy isn't "using you" when in the friend zone. you are free to leave whenever you want but they probably do stuff for you to that you don't notice seen as your so obsessed with having sex with them like help cheer you up when your down, they might do you a favor every now and then like any other friend of the same sex.
If some other person gets the one you like don't think you are the only person that has true feelings for them. your feelings are no different than anyone elses
There is probably people you have freind zoned so dont act so innocent either
George: Oh forget her! She's a heartless bitch! All women are the same!
Suzy: Excuse me? First of all I can't help the fact that I'm not attracted to Bob like that. Second of all I lost one of my closest friends who it turns out was only pretending to be my friend in hopes of getting in my pants, and I'm the villian here?
Kyle: She said that "You're too good a friend for me to date you..." then later asked "Why can't I get a guy?"
Brody: Dude, you're in the friend zone. Look up urbandictionary.com and askmen.com so that this emotional castration doesn't happen to you again! XD
The female will then say something along the lines of, "I'd rather just be friends." This is apparently some sort of 'bitch move'.
See also girlfriend zone and butthurt.
Guy 2: "Dude, you got friend zoned."
Guy 3: "Um, dude, she just doesn't have feelings for you. Get over it. She can't control who she's attracted to."
Girl: i think we should stay friends. sorry :/
me: (in head) why does god hate me?
me: ok so i take it im too ugly and nice, im going to take steroids and abuse girls i like emotionally and physically now.
girl: *goes on about how assholes dont get girls*
me: lying bitch
and this is why the friend zone sucks.
Ted: I know, man. I irrationally hate her now.
Sheila: Ted is such a great guy, I'm lucky to be friends with him!
Cassandra: I know! Would you mind setting me up on a date with him?
Sheila: Sure! I think it would be great if he was in a relationship with someone! I would date him myself, but I don't have any romantic or sexual feelings for him. But you would make a great girlfriend!
If you're stuck in the friend zone, it's just as much your fault as it is theirs, if it's not mostly your fault.