Congratulations on your upcoming marriage. You are perfectly fine. Just remember that you need to be kind and gentle with your new wife and also be aware of her needs too.
The vagina only has nerves in its front couple of inches. No amount of length past two inches or so will make her feel any more excited. It's what you do with the equipment, not the size of the equipment, that matters. Men compete with each other about penis size, but women are not particularly turned on by bigger penises, they can in fact hurt the woman a lot by bonking on her cervix. Women want a good and kind man who cares about their concerns and thinks they are special. That is what makes a good lover.