About my marriage

My fiancé's mom and my mom were best friends and they are still best friends. We met when we were only seven. My fiancé knows all my old childhood memories and everything about me. I am a bit shy so I feel anxious when he talk about having babies. I don't know why but I feel shy about having sex with him. Our wedding day is two weeks later and I don't know what can I do. Help me please! !!! When he and I were fifteen our families went to a summer vacation together and we decided to marry or date with each other if we haven't got any ideo about our love lifes. So what is your comments and suggestions? ?