Marriage and Babies!

My fiancé and I are getting married in July and we're planning on having a kid right after. I am so excited and can't wait. But I'm really young and also kinda nervous. My family is going to be pretty upset that I'm doing all this so young, but I can't wait/am so excited to start a family with him. It is a little scary though. Any feedback, tips, or words of encouragement would be greatly appreciated! Just kinda wanted to tell someone.