No, not every girl needs a friend group, and to be quite honest, girls are mean. Granted we need friends to build us up or just to have a good time with, but they can be those sporadic faces you see in the hallway or at work or at the grocery store.
Not everyone has that group of friends that comes over their house uninvited just because they like being together. Some of us like being alone, watching Netflix alone, reading alone, ect. While I have many acquaintances and "school friends" that I talk to on a semi-regular basis, I don't have a friend group and that's okay.
I have my boyfriend, I have my best friend whom I tell everything to, and I don't need much else. I just like my alone time.
With a friend group, there's drama, competing for affection of others in the group; maybe having a crush on someone in the group but you can't tell anybody because it will get out to the group and most likely the person you like, personalities can be too similar or much too different. There are so many factors about why groups fall apart or about why people get kicked out of groups.
I'd rather have my alone time and my sanity.
When I was in a group there was so much competition to find out if one of our friends liked me or another girl more as a best friend. Because I got to close to said person, the girl got jealous and started being nasty and passive aggressive. So I shut her out; I didn't need that in my life. I knew that they were closer and had been friends for a longer time, and I knew I posed no threat. Nonetheless, I was basically kicked out of the group and I still feel the stings to this day.
Having a friend group is not a horrible thing, if you're a social person, which I am not. It's probably really nice having several people to talk to. And to be able to get several different perspectives on a problem you may be having.
However, in my experience, there are too many people to pay attention to and too many arguments and disagreements.
Some people just don't fit into the town they were born in. They don't fit in with the people, the popular sports and activities, or just generally the environment of their hometown. They don't connect with most people, and it's totally okay to not have a friend group for them because they don't really feel a connection or reason to immerse themselves in the town with these people.
If you don't have a friend group, it's totally okay. It's just because you haven't found your niche in the world or your place with people. It's not a bad thing or a weird thing if a girl doesn't have a friend group; it just means she likes her alone time. She likes to sit under her weighted blanket, watching Netflix, eating a bowl of popcorn by herself; and to some that's the most relaxing part of their day.