People think that because we are younger (both in our early twenties) we aren't meant to last. Well, we have been together for 4 years this year and gone through every emotional obstacle you could think of! However, an older couple that has met and married within 6 months has more validity than we do. It's so annoying. My fiancee calms me though, and says we aren't there to prove anything to anybody. If someone figures out we are a couple, we aren't lovey dovey in public, but it is obvious we are together then it's ok for them to ask.
I may be young, but I have gone through all those dumb younger teen mistakes, impatience, regret, and pain to know that this will stick for at least more than 10 years lol.