So you've been trying to get on the right side of this girl, with a view to bagging her as a girlfriend? And you told her this straight up? I think that might be your problem
"I started talking to you because I really, really want a girlfriend and I like you LOADS" (or words to that effect)?
Number one thing to say, to scare someone off?
That and the fact you're texting her twice as much (and then some) as she's texting you, even if you didn't tell her how desperate you are, it's pretty obvious from how much you're harassing her!
Gonna have to play it a hell of a lot cooler than that if you're hoping to get anywhere with any girl, ever!