I have listed five of the main disadvantages of being an only child.
ONE----Not knowing how to fight. Believe it or not, learning to fight and have disagreements is a useful life skill. Having no one to fight with while growing up means that you have a lot of catching up to do when you hit your adult years.
TWO----Unaware of other’s opinions. A related effect of not having to disagree with anyone is ignorance of perspectives outside of your own. When something goes wrong or bad, some think their approach to PROBLEMS is the only one and expect others to see it the same way.
THREE----Loneliness. This is usually the first disadvantage that comes to mind when people think of an only child. Well, it’s true. There are many times where children without brothers or sisters feel like they are "only and lonely.” And they grow up often wishing to have a sibling.
FOUR----Discomfort relating to other children. Since only children spend so much TIME with adults, many never feel comfortable in RELATING to other children. Some only children don't really know how to let loose and play like the other kids.
AND FIVE- Having to do the washing ,the dishes, the vacuuming and all the rest of your family's chores PRETTY MUCH alone.
Here are some meaningful quotes i found