6 Years, so?

I've been with K for 6 years which for some people is weird for our age group. It was exasperating when we meet some new people and when I tell them we've been together for that amount of time they usually displayed the following reactions:
1) Look amazed 2) Look me all over 3) Look at my boyfriend from head to toes 4) Look a bit quizzical

I wonder why they react like that. At first my thought would be because ' We got together very young and still stick together after all these time and that's weird for people our age'. That was until last year at a steamboat restaurant, K ran into a friend from high school, that guy was sitting with a bunch of school mates we have seen but were not close to, they were giving me a weird look. Then one of the guys commented snidely, 'How come they are still together?'. K nearly punch that guy if not for the presence of our friend. Apparently according to my friend who knows that bunch of idiots perceived me as 'unattractive and fat', they could not understand why my boyfriend has not jump to another fresh meat. Well, what the hell that gotta do with them anyway?

And now in university, people( especially guys and some snobs) asked the same question among themselves. Well I hold no grudge towards these people just can't understand why they cannot accept that some relationship do last more than 3 months of lust. Apparently some of my friends also faced the same problem, some acquaintance look at them strangely when they said they have been together more than 3 years. Yeah, we are only in our early twenties but does it means we have to change boyfriend/girlfriend like we change clothes? Or for some of the guys out there, do you think just because I'm a size 10 without the attractive of a supermodel i do not deserve a boyfriend that last longer than 3 months? Sheesh, that got me thinking of various bad thoughts of why some of them can't keep a girl for more than that.

Well, my boyfriend is not the most handsome guy on the campus nor does he rich and I wasn't a perfect shape with an angelic face. My point is, sometimes it was hard to find someone who you can talk about everything and feel safe and happy with. I found just that in K, i guess that is why we are still together. But make no mistake, I'm not the type of girl who dreams of wedding, naming kids and fantasize about living in a huge bungalow and live happily ever after. I enjoy my time with K, I've no fancy expectation of being forever with him. But some of my friends thought I'm going to lock ken in my dead grip and force him to marry me. Come on, do i really look that desperate?