Big surprise, you don't understand the concept of the friendzone.
The friendzone isn't when a guy is only a friend despite being nice, it's when a guy is only a friend because he is.
I actually wouldn't mind if a girl just wanted a guy as a friend because she wasn't physically attracted to him. It's honest, and there's not much we can do about physical attraction, and it doesn't say much about us personally.
I'll share a story as an example.
There was once a girl I knew. I would act a little cocky around her. I'd avoid answering her questions directly, instead choosing to interpret their meaning in a different, silly way, to tease her.
I wasn't a complete asshole, but I was a little douchy.
One night she got drunk and told me she had a crush on me, and masturbated fantasising about me. We made out a bit.
A week or so later, the same happened. But she was upset because of tough things happening at home, and started crying. I hugged her, to comfort her. By the end of the night, she decided we should be friends, and that her attraction was gone.
That's what I consider the friendzone. When their attraction is killed because you're a decent person.