Are we too young?

Diana
I'm 17 about to be 18, and my boyfriend is 18. He and I are already planning to be married by the end of the year or even next year. My family is always joking around saying "oh when you two get married wait to have children or they'll ruin your life" but I don't feel that way, I think children are the most beautiful gift a woman can give her husband, regardless of the age. In my opinion, it doesn't matter if you are 18 or 38, no one is ever truly ready to start a family no matter how much they try to make it seem so. Any advice about marriage and children? It would be very appreciated.