R u ready for Marriage at 21?

Hey guys!! well this is a very interesting blog to me at least because the question on the title i think just esplains why its so interesting!! Anyways some ppl might think they're ready for marrige in their late teens or early twenties, but statistics say that 4 out of 5 young marriages will fail within a year! Is it really true? Well I've seen alot of young marriages fail, but some succeed! So im guessing its different with everyone! In my opinion well im very confused! I have alot of friends who have gotten married young and well after a while they start talking about how unhappy they are and that they r still waiting for their Prince Charming! and im like i thought you found him a long time ago? So this is all very confusing for me! You see I'm really scared because my Boyfriend and I have been together for a year and four months and he's already talking about getting married next summer by then we'll be together for two years! I'm really scared that its not going to work out, after that i wouldn't know what to do with my life! So I really need help on this one! What do u guys think? Share your thoughts with me!