My Relationship

We are 9 months apart. He is 16 turning 17 and I am 17 turning 18.  The relationship is very stressful on top of other things I’m an dealing with right now. Me and my boyfriend have known each other since about May of last year but we started dating in January this year. I want to start my family before I’m 20 but he doesn’t want to start until he’s 25. I’ll be 26 a couple of months after he turns 25. The only reason he doesn’t want to start until he’s 25 is because he wants to risk his life doing stupid shit without worrying about leaving a kid behind if he dies. He wants to go skydiving, rock climbing, scuba diving, spelunking, etc. while they do sound fun they are also extremely dangerous. I just want to at least be pregnant before I’m 20 or while I’m 20. He has 3 years to do stupid shit without responsibilities but no, he needs 8-9 years to risk his life. It’s like he just wants to play Russian Roulette and be an idiot while I actually want to start my life. He also only wants 3 kids at best but I want 4-5. He wants to just “live in the now” and let everything play out and not think about this stuff right now. I’m almost 18! My future starts in 6 months! I need to know if he will start that family with me. I can’t just “go with the flow”, I need to know my future. I have been craving a family since I was 11. I have waited 6 years for my family, I am NOT waiting 8 more so he can go almost die. Before him, I was with someone that was everything I wanted. Let’s call him A and my current boyfriend T. We were together for almost 2 years but then he randomly ghosted me In the beginning of 2019. It wasn’t like him at all and I still have no idea why he did it. He would have started a family with me young, he would have taken on the responsibilities while also living a happy life doing whatever. We synced, he knew me and I knew him. This relationship, however, is nothing like that. We aren’t synced. The best way I can describe it would only be understood by people that watch Soul Eater, it’s like I want to be his  Meister and he wants to be my Weapon but our soul wavelengths aren’t compatible. Me and A were compatible, we had soul resonance but me and T would never be able to do that.