I was an only child, which used to be very uncommon.
Yes I do think it is very uncommon. My mother is an only child and she really felt the effects of it when her mother became to elderly to care for herself, and my mom has no siblings to help
I wish I would have had a sibling to grow up with me. I missed that strong emotional bond.
Yes theres that too. I wish I could say I understand but I don't, I have a little brother.
I would imagine your relationship with your brother is a very unique one.  Like a friend with the closeness of a parent.