We dont agree on anything!

A bit of the back story for you. My boyfriend and I have known each other for 24 years and just started dating 5 months ago. He's 51 and I'm 38. We are a bit old for this lol! We both have kids from previous relationships. He even had a vasectomy a few years ago that obviously didnt take!! I knew going into this relationship that he is stubborn and set in his ways. He let's me parent my son my way and he does his way with his kids. No issues there. The issues are when we talk about this new little one I am carrying. We cant agree on names. He refuses to let my sister in the delivery room (my mom has passed and so my sister and I are super close, my second mom). He doesnt even want to find out the gender!! I couldn't wait to find out with my son!! I'm only 10 weeks so I know I have time to try and change his mind but i cant help but feel like I've got no say so in any of this! Its not just "oh no I'd rather you sister not be there" it's like "if she's there I wont be" AND THEY ARE FRIENDS!! How do I get him to see that I need to have a say so in this too? I want to compromise but it feels like hes stuck on his way or no way.