Why is everyone so uptight about teen marriages?

I've had plenty of wisdom in my life to know right from wrong. Age is a number,but most seem to think that well if you that young you "can't" have or do. All my life, I've had plenty of boyfriends to know the difference from Real love,and False. I meet a guy last year,the first that actually accepted me for me. The one that didn't just want me for what I could offer. We enjoyed everything. He brought back a part of me that many had taken. He made me feel good about myself. And now we're getting married in a month. I get all of these lectures about "your too young" or"***** your stupid" etc. Why does everyone insist on putting their 2 cents in?? If your happy then it should be okay right? Everyone should be able to live their life as they choose. We're always hounded about things like that. I mean my families don't care. They love my fionce. I love him too. More than anything. Its funny. Because most adults will meet someone in a month and end of marrying them. Bizzare things like that. But yet I'm wrong for being with someone for a whole year and change!! I'm wrong for being happy.. Where is the fairness in that?? Opinions appreciated. Just be mature about it. Ty <33 10pts