I made an interesting observation recently. A month ago, I decided to "retire" a couple of the places, I used to go to for fast food and coffee. I'd go there to interact with the female staff that I found attractive. I'd rarely try to close, mostly opting for passive awkward conversation, of me trying to be clever or run game. It was hit or miss, approval seeking and I was tired of doing it and being reminded of my history with it.
I decided to start going to a different local Starbucks, to get coffee and read at regularly. I also decided to stop acting clever and instead, be in the moment aka let my mood fluctuate naturally.
I noticed quickly that I got into just as many, or more conversations, with the staff and fellow customers, as I had before, at the other Starbucks, when I'd tried to be clever/tailor my attitude to whatever I thought would win peoples affection. This time it felt natural and I didn't feel like a fraud and self-conscious, when my "act" didn't pan out.
Most importantly, the people I gelled with naturally, became that much more clear to me.
That part in bold is important. When you put on an act, when you try something you feel is fake, you feel bad when it fails. When you let things occur naturally, with no false pretenses, no "game", failure doesn't feel bad. And the connections you make are far more real and solid.
Be real, be natural, quit putting on an act. You don't have to earn her number. You just have to ask for it. You don't have to wow her, you just have to talk to her. If it works, it will be solid. If it doesn't, you won't feel bad about it.