I am a lesbian and I've fallen for my straight best friend!

I have a ginormous crush on my best friend. Actually, with that crush I confirmed I am a lesbian.
The other day we were talking about loves, and the relationship topic came out, and I told her I am a lesbian.
Last night, she found out that I had a crush on her because someone told her. She asked me, and I knew there was no going back, and I confirmed it. She told me she was okay with it, but she also told me she was straight.
Now here's the deal: people told me to forget her, that she is straight and all, that I should do a "list" of the ideal girl I want that is actually a lesbian. Before I met her, I did have a list, and practically everything that is on that piece of paper is in her. I once tried to focus my attention on other girls, but there was an incident with one that I thought I had a mini crush on, so I'm scared of doing that again.
I actually think that this ha gone further than just being a crush, and that I am actually in love with her. It's not a crush, I had one before, but this time is different. She makes me feel bigger than a razor (I self harm). And no one else can do that. I feel like the world is going to end if I don't see her, hearing her voice became as vital as breathing. People say I have to forget her, but I just simply can't. As I said, its more than a crush.
What can I do?

wow I can totally relate to this situation I had the exact same crush on my friend! like she was everything I could ask for trust me I know how you feel! but I'm Bi not lesbian....I found it hard also to get over her im that way...the advise I can give you is to separate youself from her..like don't sit with her or talk or make contact..usually keeping out of touch can eventually fade away the feelings..now it is very hard to do that but I did it and got over the ginormous crush..now to this day we are really close friends and I feel nothing more than that since I didn't talk with he for like half a year...so try doing that it can help if it doesn't the you have totally fallen for this girl and you can't control what your feeling do it's just what happens it's life..but try and have a go at doing that(:

hope this helps(: