This Poor soul

So I tried climbing a small mountain with her as sort of a fun date activity. Not even 100 yards from the summit she sits down and refuses to go to the top, which was an easy stroll away, so I ended up going alone.

This has become a metaphor for our relationship in a way. I want to start something, she goes along with it but never commits, and expects me to finish everything without her.

In addition, she refuses to get a real job (she claims she has a job, but makes less than $400 a month). We don't plan on having kids (I don't want any), but she seems to think she'll still be able to sit around at home all day with her computer and leave me to work my ass off and support her dreams, but at the same time she won't push her limits. She also refuses to drive, and I act as her taxi service, and I do most of the cooking, cleaning, and shopping. She mostly wants to watch movies, play games, screw, and go out. (for some people, an active sex life and shared interests is all they want in a relationship, but I can't afford to support her, nor do I want to.)

We've been dating for two years now. We get along well as far as interests and hobbies, but it's becoming clear that if I take things to the next step she'll be more of a hindrance than a help, so I haven't been able to bring myself to commit to marriage, and I don't think she'll ever change her ways, and I'm tired of being alone on top of the mountain.