Turning 26? You Better Get Married and Have Babies!

Okay I promised myself I wouldn't rant, considering this is the first post here. I'd like to know, however, why I can't be happy for people who tell me they are getting married. Some select few I can, they're making good money, they've 'grown up' essentially, whatever. But let's say for example that someone is going through tough times and all of a sudden they realize how valuable their bf or gf is and how much they LOVE them and want to marry them. Or let's say they get knocked up. All great reasons to get married, right? I just don't get why marriage has to be the next logical step. So people can feel better about themselves? Secure in the fact that their spouse can't just run away? Because that's what you're supposed to do? Because you get a tax break? (hmm maybe). The first wedding I went to a few years ago (not counting when i was a flower girl when I was 5) ended a year later. Sweet. Now that i think about it, the wedding I was at when I was 5 ended up in divorce too. Let me tell you how much that makes me want to get hitched and throw my cares two sheets to the wind. I guess we're all hoping for the relationship in The Notebook.
So please help me someone, why can't I be more positive and happy for these people that have just decided to do the norm because they weren't doing anything better with themselves? I'm sure I'll change my mind one day? I'm going to be 26 soon and am planning to throw myself an "I'm Not Pregnant or Getting Married" Shower. What does that equal, about 26 bottles of Beam and an eight ball?