I don't feel like I fit in either. I am not particularly nice. I am not all warm and fuzzy. My views, beliefs and approach to almost everything seem to be odd to or at odds with others. I usually start from the point of no one is going to like me and if I am not dead flat hated by a majority I am doing well. I have never wanted to popular, although I do not enjoy being disliked,(popular seemed like so much effort and a burden for little return). It took until high school to have friends. And they were the nerdy band people. And even to them I was odd in my beliefs about things. I learned ways of keeping my integrity but not giving my views in a fashion that was so odd or intense or whatever. My family thought I was odd, and despaired of me ever fitting in. With them, I found fitting in was not worth the cost.
I think a small majority of people in the world are actually popular. The rest are sort of on a scale like is being presented here.