Props to you for taking action and having some fun in the process.
You mentioned that they finded you unattractive. Have you heard the concept that "attraction is built in the push"?
Try to be more of a challenge to these girls. It spikes their emotions, and they have to chase you at some point. The opposite never works, I believe.
So learn some spikes, challenges, qualifications, etc. Check out Tom Torero's archive. I can send it to you if you don't find it.
Keep up!
p.s: Also, this girl that approached you - maybe you should have "bounced" her somewhere where you can continue your conversation as if it's a date. In nightgame that's what you should be doing if things are going good with a girl. This is the escalation process. The first bounce is maybe to a quieter part of the club. Or maybe to the bar. Or a table. Or outside "to get some fresh air". Whatever. Try it sometime.
My point with all of this, I guess, is that you need to have some structure and knowledge (theory) of how things happen. Just talking to them like a friend won't do it. There gotta be some friction (flirting, etc.), and you have to lead, eventually.