My SO was an only child and he says he was lonely growing up, he would call his cousin his sister sometimes.

I think having siblings is a good for children and adults. as adults it's nice to have family to lean on when your parents get old etc.. just helps to have a another person to deal with that stuff.

I am an only child and was also really lonely, my childhood had some other kids around me, but for the most part I do feel like I missed out on a lot because I was alone a lot too or just around adults. I got to the point where I didn't want to do anything with kids Bc I much more preferred to be around the adults instead

No it was just me. I was adopted though so my life wasn't exactly "normal". All my parents family lived out of state

did you have any family around your age that you were always around or was it just you? @housfullofgrls

I was an only child and I was very lonely. I also had social anxiety though, so it was hard to make friends