It's like this. Almost everybody can be friend with a girl. If you look attractive you can turn that into a relationship anytime, If you are not you get "Friendzoned". In her mind you got friendzoned already the moment she first saw you and decided you are not in her league. If she's not in your league you would never get friendzoned even if you do nonsexual things with her every week.

People who get put in the Friendzone for their personality are just complete fuck ups, because a girl would still have sex with you if your personality is really bad.