Realising as an only child I don't know the meaning of a family

I 19F obviously am an only child , realised I don't know the meaning of a family , I don't what a true family is , and that is due to so many factors, being an only child is one of them but because I tried to fit in with my cousins who have siblings but it's never the same , my father's side is toxic so I cut them off permanently, whilst my mother's side are absolutely darlings and all , I've always found the age difference between me and my cousins too difficult to bond over, my parents fight a lot which caused me to grow up unaware to what actually a loving family is, I also fight with my dad quiet a lot , but today after a fight I realised I really don't know what a family is , my cousins , friends everyone has siblings , they grow up with a lively household , whilst mine is like an abandoned one , and I truly believe day by day I do not wish to make my child in the future an only child because it's heart wrecking