<human>: Could you distill the essence of the text into 1-3 sentences?

Like the title says, me and my gf have been dating a long time, and we've talked a lot about wanting to spend our lives together.  Recently, a lot of our friends have gotten engaged, and even though we're still very young, I can tell she's a little jealous that some couples we know are already engaged even though they haven't been together as long as us.  

There's also the issue of me/us not having a whole lot of money to spare being college students, so the thought of dropping 3 months salary on one thing seems daunting to me right now (I know you can get payment plans, but even so).  

Like I said, I have every intention of marrying her, so is there anything I can say right now to reassure her that it will happen soon?  Also, if any of you got engaged young, what was your strategy in finding and paying for an engagement ring affordably?
<bot>: How can I reassure my gf that I want to marry her sooner rather than later, but not right this second, and how did young newlyweds of r/relationships go about buying a ring?