I am currently doing my bachelor in padagogical science and I can ensure you that group dynamics and individuals position in those groups very seldom have anything to do with the individual. There are contributing factors in all personalities involved, but it more often comes down to how a group is situated in what context. Often youngh people internalise their roles and continue to act according to them in different groups. So, take it as a scientific fact that you very likey didn't do anything wrong as a child, nor had a personality trade that was the sole contribute to beeing ostracized.