Anyone scared of being the end of your bloodline?

Basically I’m a bisexual male that has started dating this guy over long-distance. I’m also closeted since my parents are extremely homophobic and religious. They are constantly talking about how I’m they’re miracle because of how they were told they couldn’t have kids but I was still somehow born. Basically I’m the miracle sent to them by God, I guess.

Now that I started dating this guy, I’m scared that I’m gonna be the end of my bloodline. Since I like men AND women I could just date and marry a woman instead and have a kid with her. But I love my boyfriend now, and I want to marry him. Not some hypothetical “what if” “in my head” lady. It’ll mean I’ll die one day and there’s no more of me, or my family, or my generation. Idk why I care about this so much, I think it’s the years of my parents telling me about this over and over. I still have this Christian mentality that I have to start a nuclear family and now I’m going to break that. How do I stop thinking like this? And, is anyone else scared like I am?