<human>: We've been seeing each other for roughly four weeks. I'm 19 and she is 21. Both female. We've agreed to take it slow and not yet have sex. I'm fairly inexperienced with relationships and sex. She has told me that she's had a lot of casual sex. I should mention rather recently before we met. Even though I'm not ready to have sex yet, I'm concerned that she isn't ready to have sex with me. 

If she's been so quick with other people, why not me? I keep telling myself that it must be because I'm special and she wants a good relationship with me. She has told me that she wants to have sex with me and when I told her I'm inexperienced she said, "I'll fix that." and she's said that I, "make her horny." 

I don't understand she wants to wait. She said she wanted to wait before I mentioned I wanted to. So I have ruled out that she could just be saying that to make me feel comfortable because I want to wait. I can't help but feel confused as to why she isn't ready. I also feel jealous.
I know relationships are about communication but I'm nervous about bringing it up.

I would like some other opinions on this. I keep going over the situation in my mind but I'd like to know what other people think about it.

Summarize the given text in a few sentences.
<bot>: Girl I'm seeing isn't ready to have sex with me despite being so quick and casual with other people. I'm not sure if something is going wrong or right with our developing relationship.