My (Almost) First Time

Jessica
I'm a virgin and my bf isn't. We were ready to go, he was hard, I was lubricated, and we had a condom. But when it came time for him to put it in...it wouldn't go in. I don't know if it's me or if it's because he's quite large down there. Anyways...any advice? We were both really looking forward to it and extremely disappointed when it wasn't happening for us.