That's daygame! Get used to the rejections. Firstly, give yourself credit, you faced your fear and went over and approached her, daygame is hard, that's why most guys don't do it. You have to crush your ego and in time you won't care about the rejections. Most importantly, learn to enjoy talking to beautiful women, regardless of the outcome. Judging by what you said happened, it seemed a little uncalibrated. You need to learn to become comfortable in the uncomfortableness, and you can only do that through a lot more practice. I would direct you to Tom Torero's Beginner's Guide to Daygame on Youtube, that will give you some structure to get started with. And to give you an idea of the kind of work you may have to put in, Nick Krauser (A well known daygamer) had to do around 1000 approaches before he got laid from a daygame approach.