chances are if you are in the friend zone, you're already screwed. If she really liked you and knew you for so long don't you think she would have made an initiative?

I had a similar experience in high school, I was head over heals for this girl. I was very close to her for years, but never took it further. Trust me, you will regret not trying. If she doesn't like you that way, there is a good chance it will hurt/ruin your friendship. But take it from me, it is worth it to know!

I still regret never asking her out, I never let her know, and now she is married. So my time is long gone now, and honestly I'm not the same guy I was when I was head over heals for her so even if the chance came, its too late for me.

Just grow some balls, and ask her. Don't be a pussy about it, usually if you are her friend its because she doesn't think of you as dating material, so you gotta show her you are dating material, IE you are a man. It'll be worth knowing, even if she turns you down.