A change probably won't come...
If she annoys you now, she'll piss you off later
For some reason, you guys think that as a relationship progresses (through serious relationships or marriage) that the things that she did/does that causes friction or that you don't like while you're dating will some how magically disappear when you make a serious commitment to her. Like some how that ring or whatever will make your relationship suck less. Like it'll magically erase all the problems you had while you're dating. More times than not, those small things and annoyances become huge problems down the line.
You know how there's that saying that men will change for the person that they're willing to change for. Well women will change only if and when they feel like it. ONLY. If she doesn't feel like she's in the wrong, she won't change. If she doesn't feel that her actions are detrimental to the development of the relationship, she won't change. If she doesn't feel that your feelings are important enough to her to change her ways (in a normal relationship give-and-take scenario), she won't change. If she doesn't feel like she contributes to the problems in the relationship, she won't change. And there's probably not a whole lot you can do about that.
Before you give your heart to a girl who may not be worthy of carrying it, really take some time to look at the things she does that bother you now. Look at the things she's not offering you now (emotionally, spiritually, physically). Look at what she values, how she treats other people, how she treats you. Look at her ambitions, her drive, her goals and ask yourself if this is something you can tolerate in the long run - no really think now----NO really think! If you decide to proceed with her, you're deciding to live with those things. Period. If you're not happy now, with things being the way they are, how do you expect to be happy later? Can you live with that? Should you have to live with that?
Dating for a change doesn't typically work. So the same relationship advice they give to women, I'll give to you: Never enter a relationship with the intent to change a person or believing (or hoping) things will get better. You have to take her as she is, just as she'll have to take you as you are.