*hops on a little late* But I can't resist throwin in my two cents anyhoo...
I will agree with the others, that it's not wise to go on with the engagment to your gf, if it's going like this now. Marrying someone who's not 100% happy with you is only setting up for more disaster later.
Not gonna get into my married life, but I will agree there were times I wish I spent more time dating to make sure he was "the one". It's kinda like the movie, Jerry McQuire... where Tom Cruise's character jumps right into marrying the single mother just cause he liked her first impressions... but then later they wondered really what reason they married each other if true love didn't feel like the factor anymore. Fortunately, they were able to patch things up...
But really, just to save yourself from thinking about divorce every few months thereafter... marry the women you *really* feel comfortable with, and that she also feels the same way with you, no matter what life throws at ya. You still have time... and well, maybe you are better off being a bachelor. One of my cousins is almost 50 and he still had not commited himself to a marriage.