People who think theres such a thing as a friend zone...
1) doesn't understand that she's not interested, stop saying you're such a nice guy.
2) Just because you're nice and sweet to a girl does NOT mean you deserve/automaticly get her.
3) She's saying she wants to stay friends because you're probably creepy or not her type.
If you really think there's something between you and a girl then forgetin do it. If she says no it means she's not interested and you should move on because she is not interested in you.
Being nice is a choice. Having a personality that suits your girl is not.
Hope I made myself clear here.