<human>: Give me the gist of the text in a nutshell

We have been together for almost a year, and are still in college. Since the beginnings of the relationship she was referring to me as a future husband and planning for a future together. She would often talk about stuff that we were gonna do when we were married (what house we were gonna buy, how much to spend on our wedding, etc). This weirded me out at first and made me uncomfortable because I was more concerned about my grades and getting a degree rather than future plans involving my SO. 

Yet I got over it since I was not looking for a casual relationship with her and might actually wanna marry her. This kinda made her mad because she assumed I wanted to marry her right away, while I thought of the relationship as testing if we were compatible. I notice that we have really different personalities, but I did not consider the premature talk about our future plans and referring to me as future husband as a deal breaker. She still gets mad at me because I offer little to no input in these conversations lol.

I always thought that having differences would "spice up" the relationship and we would find a way to work out the little problems. Yet I faced a really big difference when she commented casually that she would like to adopt kids and maybe bear one child of mine. While I respect that decision, I would rather have my own, since none of us is infertile. That's just my opinion. I am afraid that if I approach this with my usual manly lack of tact, this relationship will go down! How should I tell her this? I realize that this cannot be compromised, it's either one or the other. How should I approach this? What do yall recommend?
<bot>: While I accepted that my SO and me have differences, she wants to adopt kids and I completely disagree with this. How should I approach this?