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i haven't seen this girl in person since 2010 in high school. she's just a FB friend now. im just trying to go for my HS crush which i never had the balls to do back then. i won't go down without a fight.
You went totally wrong in my opinion, textbook example of a friendzoned chump that finally had guts to approach his crush, in romance novels this kind of behavior always leads to them being together, that is a lie, in romance novels the girl is always in love with the poor chump and is just waiting for him to ask. In reality though woman moves on very fast if you are not acting, she will write you off even if you were attractive to her before.
Getting from the"just a friend" status to "potential boyfriend" status is an uphill battle that usually have to involve at least two things 1. total makeover both external and internal and 2. another woman. Yes that's right, the only way for a girl who friendzoned you to start viewing you as a potential boyfriend is to make yourself a better you and then find another woman who will have this better you. This should(hopefully) arouse in the girl one the feeling of, well for the lack of a better word betrayal.
If you only make a change and you do not find other woman she will feel no pressure to reclaim you, she will feel she owns and deserves better you and nothing will change. To actually be interested she has to feel like she is loosing you, and since she considered you her "check for a rainy day" she will try to reclaim you, it is imperative that you do not return to her like a good puppy as soon as she calls, let her work her ass off to get you back.
With all this said it is entirely possible she will not even care, and even if you succeed the baggage from your AFC days will be a hell of a burden for a relationship, so i would not bother, but if you have to face her by all means do it, but make yourself ready, this will be very hard battle.