Highly confused...

 I'm pretty sure that there are many stories like mine, but i really need advice. Here goes:

I met this girl 9 months ago at my job. When i first met her I didn't like her because she was really rude. But after a month, I started to talk to her and we really hit it off. We have a lot in common and have great chemistry. Ever since then we have become best friends...I spend almost every single day with her and i talk to her every day whether it be through text or an actual phone call. When we are at work she is always hugging me and is always talking to me and grabbing me and finding a way to touch me. She tells me that she wants to marry me because we are "soul mates". She always kinda says it as a joke so I never know if I should take her seriously. And when we are alone there is always this tension that i feel between us and it kills me. We are always very friendly with one another and everyone at work thinks that something is going on between us. I really think that she is into me but that she is really scared of coming out with it. It really frustrates me because one second she is all over me and hugging me and the next she is talking about how she really wants to have sex with a guy. When she is around other people she is constantly talking about guys and how she needs sex. It drives me crazy because I have fallen so hard for her and sometimes i feel like she is into me but I don't know. She told me that she has been with a woman before but that she didn't like it. The only person that knows about how I feel is my other best friend. I'm not sure what to do because all this girl does is give me a whole bunch on mixed signals. One time we were talking about how ironic it is that we are kinda each other’s other halves....and she said "we are totally soul mates but too bad that you are a girl". What does that mean? She also loves to pretend that we are together and loves telling me that she is "putting out" and waiting for me to put out. But she always says it as a joke. I know that this is really long and all jumbled but I'm just writing some of the story. The funny thing is that this isn’t even half of the story. I appreciate any advice you have to give :)