Being another member of the "I got married way too damn young" club, I'll agree that you shouldn't bet it all on one girl. However, I'm not exactly qualified to tell you how you feel or how to handle those feelings. Take Kath for example. Things were tough, but they made it (extremely inspiring to me, btw). Me and my ex didn't and so many more don't. It would probably depress us all to know the know the number that fail compared to those who do not. I'm a firm believer in what is meant to happen will happen. Unfortunately, my impatience hasn't allowed me to let what is supposed to happen, happen to me. I always have to open my big mouth, run away or intervene in some other unnecessary way.
Yeah, we're complicated as a mother fucker.
Ya'll may have seen this before, but in case you haven't,
http://www.anvari.org/fun/Gender/Women_are_Evil.html