I worked with this girl at a charity shop today, I only met her last week and we got on really well. Today however I hardly managed to talk to her as annoyingly the manager made me work upstair while she was working downstairs. I was frustrated at this as I had prepared for today since we met and knew if I was downstairs I could be building some good rapport and making her attracted to me. Before I left work, she was still working for another hour, I went up to her and asked did she want to hang out sometime?

I asked in a really shitty manner, I was nervous and hardly talked to her before asking, I also talked some bullshit about how I enjoyed working on the shop till. After I asked, I showed some unconfident body language, like yawning etc. Basically it went pretty shit, but at least I asked in a less than ideal situation I guess. She said yeah however I dont know if she was just doing it to not embarrass me as I asked her infront of another colleague (I had no other choice). She added me on facebook and that was it. I think she will flake.

tldr; I asked this girl to hang out in less than ideal circumstances, I was real beta, she said yes but not sure if it was sincere and if she will flake, I should be feeling good that I asked, but I am feeling pretty shit at how bad it went.

Most likely she will if she is not atleast attracted to you... But if she said yes then just see what happens. Don't put all your eggs in one basket. Get out there and talk to other women.

Feel great she said yes! Girls get nervous too Bro, no big deal.
Regain your confidence level when it's time to ask.

Don't say shit like "Do you want go go on a date Saturday?"

Say "I'm going to ______ Saturday, your joining me, meet me at 7!"

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They call me the cat whisperer, cause I know exactly what the pussy needs.

getting frustrated because you cant interact with a girl on a given day and then going up to her and asking if you guys can hang out is needy behavior

and i read the full post and obviously you know what went wrong so ill just stop pointing out.

what you should do is forget what you did and just be doing your shit at work. when you get a chance of working on the same floor build rapport with the girl and take it slow. if you dont work on the same floor on that day dont go all afc after 3 weeks of intermittently seeing her you can ask for her number to ask her out. if you never get to work on the same floor as her never again dont go all afc about it just forget about it. if you cant build rapport with her on this time you can still go for her number but it might not go well for you. rapport is the key. you can still try though, theres nothing wrong with trying but dont go all afc over her if she doesnt like you bak
good luck buddy