People will come and go throughout your life and I completely understand that is a really scary concept for most folks. Blood family connections are mostly a given in life (whether you want them or not) but all other connections are something you have to consciously work at. You just have to keep an open mind and look for opportunities to form those connections with others. Maybe you'll become a mentor for some else going through a similar life situation. Maybe you'll get "adopted" by an elder who has love to give. And maybe you'll become an auntie/uncle to nibblings (blood relatives or adopted). None of these roles will give you the real experience of parenthood and that's ok because every role is valid and there is no guarantee in life that says we get to experience them all. You'll find that the roles you come to fill and work on are the ones you really need in the end.