I read the whole thing. Some lessons you need to learn from this experience:
-Never EVER discuss a girl's relationships/crushes with her if you're interested in her. It puts you deeper into the friendzone.
-The signs were there from the very beginning when she gave you a deliberately vague answer "because I'm too me". It's obvious she was never interested.
-You must know already, you left it way too late to ask her out. Never put it off - next time you meet a girl you like, if the opportunity is there, just take it. If she rejects you, move on swiftly just like this girl did. The later you leave it, the less likely she is to say yes.
-It sounds like you're getting a bit too obsessed over this girl. Forget about her and cut contact if you have to. Getting emotional over her will make you irrational, you'll start making poor decisions and saying the wrong things to her which will push her further away. Girls need to occupy as little space in your mind as possible.
Trust me, I've been at both ends of the spectrum. I've asked out girls too late and too early. If you leave it too late, you're almost guaranteed to end up with a rejection, but if you go in too early there's a slim chance of her saying yes. Depends on the girl. The last girl I asked out too early said no, so I ignored her, then she got annoyed and said she wants to stay friends, but now ignores me herself. Whereas my ex from a few years ago said yes after I asked her out within about 2 weeks of meeting her. See what I mean? Girls are weird and unpredictable. Don't take rejection personally, it's got nothing to do with you as a person.