What you are describing is very common in early marriages. You need to dial down how you judge yourself (your language use: "unthinkable", "I know it's wrong"). Also, what you are describing is common in marriages that started with relationships in the teens in general, but for you, on top of it, there is this newfound confidence and newfound sex drive.

I am not clear how old you are. You have been with your husband since 16. You have been committed to him since 2009. Does it mean that you are going to turn 31 this year or not? How old you are is relevant to the issue of whether to have children with your H.

It is also now clear whether, upon your finding out that you have an incredibly high sex drive, you also found that sex with your husband is satisfying to you. This is also an important and relevant inquiry.

I hope you will be able to clarify the above for a more in-depth discussion. My story is a little different because when I married, at age 21, my sexual relationship with my (now ex) husband had just started, but I had known him as a friend since age 14. And I know other people who married early, married their high school boy/girlfriends. There are some success stories where marriages were sustained and people are already grandparents together, but also stories of marriages that resulted in a split early on. With that much knowledge of the subject matter, I hope I can be a little helpful to you on your journey of self-discovery and deciding what critically important steps to take now.