Telling her you don't want to be "just friends" isn't going to help. If she sees you as a "friend", chances are that she will never see you as potential date or relationship material.
What you need to do is learn how to prevent women from wanting to be "just friends". Kino and ****y/Funny do a great job at this. If you don't know what those two things are, you need to read the DJ bible.
You have to communicate that you're interested in her without doing it verbally. You also have to communicate that you're a sexual being. Women pick things up better when they're communicated indirectly. Again, consult the DJ bible.