We just can't do it

We are both virgins and we've tried to have sex but we just can't. We've talked about it, we both feel comfortable with each other, and we are both ready. We tried again last night, but he just couldn't get his penis in far enough. He was hard and was wearing a comdom and I was extremely wet, but we just couldn't get it in. If anyone else had this problem and has any advice, it would be greatly appreciated.