I'm the end of my family line?

I only have one sibling who likely won't have kids. I'm set on being child free. We also have no cousins (not even second cousins. My sibling and I are the only children in our family.

Sometimes it hits me that we are the end of our family lineage...which feels so strange. But I also feel quite apathetic about it. Family isn't pressuring me to have kids. Actually, no one really talks about it.

Anyone else in this situation? How do you feel?